Sandalwood

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Santalum paniculatum (`iliahi), Hawai`i Santalum paniculatum 1326.jpg
Santalum paniculatum (ʻiliahi), Hawaiʻi

Sandalwood is a class of woods from trees in the genus Santalum . The woods are heavy, yellow, and fine-grained, and, unlike many other aromatic woods, they retain their fragrance for decades. Sandalwood oil is extracted from the woods. Sandalwood is often cited as one of the most expensive woods in the world. Both the wood and the oil produce a distinctive fragrance that has been highly valued for centuries. Consequently, some species of these slow-growing trees have suffered over-harvesting in the past.

Contents

Nomenclature

The nomenclature and the taxonomy of the genus are derived from this species' historical and widespread use. Etymologically it is ultimately derived from Sanskrit चन्दन Chandana (čandana), meaning "wood for burning incense" and related to candrah, "shining, glowing" and the Latin candere, to shine or glow. It arrived in English via Late Greek, Medieval Latin and Old French in the 14th or 15th century. [1] The sandalwood is indigenous to the tropical belt of peninsular India, the Malay Archipelago and northern Australia [2] [3] The main distribution is in the drier tropical regions of India and the Indonesian islands of Timor and Sumba. [4] [5]

True sandalwoods

A closeup of sandal saplings A closeup of Sandal saplings.JPG
A closeup of sandal saplings
Santalum album Santalum album - Kohler-s Medizinal-Pflanzen-128.jpg
Santalum album

Sandalwoods are medium-sized hemiparasitic trees, and part of the same botanical family as European mistletoe. Sandalwood is indigenous to the tropical belt of the peninsular India, Malay Archipelago and northern Australia. [6] [7] The main distribution is in the drier tropical regions of India and the Indonesian islands of Timor and Sumba. [8] It spread to other regions through the incense trade route by the vast Indian and Arab mercantile networks and the Chinese maritime trade routes until the sixteenth century CE. [9] The sandalwood of peninsular India and Malay Archipelago supported most consumption in East Asia and West Asia during the time of the incense trade route [10] [11] before the commercialization of Australian sandalwood ( Santalum spicatum ) in sandalwood plantations in Australia and China, although sandalwood album ( Santalum album ) is still considered to have the best and original quality in terms of religion and alternative medicine. Santalum spicatum is marketed as the notable members of this group today by merchants because of its stable sources; others in the genus also have fragrant wood. These are found in India, Nepal, Bangladesh, Pakistan, Sri Lanka, Australia, Indonesia, Hawaii, and other Pacific Islands,

Unrelated plants

Various unrelated plants with scented wood and also referred to as sandalwood, but not in the true sandalwood genus:

Production

Sandalwood leaf Sandal leaf.jpg
Sandalwood leaf

Producing commercially valuable sandalwood with high levels of fragrance oils requires Indian sandalwood ( S. album ) trees to be a minimum of 15 years old – the yield, quality and volume are still to be clearly understood. Yield of oil tends to vary depending on the age and location of the tree; usually, the older trees yield the highest oil content and quality. India continues to produce a superior quality of Santalum Album, with FP Aromatics being the largest exporter. [17] Australia is the largest producer of S. album, with the majority grown around Kununurra, in the far north of the state by Quintis (formerly Tropical Forestry Services), which in 2017 controlled around 80% of the world's supply of Indian sandalwood, [18] and Santanol. [19] India used to be the world's biggest producer, but it has been overtaken by Australia in the 21st century. Over-exploitation is partly to blame for the decline. [20] [21] However, ethical plantations in India are on the rise, and India is expected to increase its supply manyfold by 2030, owing to favourable weather conditions and competitive pricing.

Australian sandalwood ( S. spicatum ) is grown in commercial plantations throughout the wheatbelt of Western Australia, where it has been an important part of the economy since colonial times. As of 2020 WA has the largest plantation resource in the world. [22]

Sandalwood is expensive compared to other types of woods. To maximize profit, sandalwood is harvested by removing the entire tree instead of felling at the trunk near ground level. This way wood from the stump and root, which possesses high levels of sandalwood oil, can also be processed and sold. [23]

Australian sandalwood is mostly harvested and sold in log form, graded for heartwood content. The species is unique in that the white sapwood does not require removal before distilling the oil. The logs are either processed to distill the essential oil, or made into powders for making incense. Indian sandalwood, used mainly for oil extraction, does require removal of the sapwood prior to distillation. As of 2020, Australian Sandalwood oil sells for around US$1,500 per 1 kilogram (2.2 lb), while Indian Sandalwood oil, due to its higher alpha santalol content, is priced at about US$2,500 per kg. [22]

Sandalwood is often cited as one of the most expensive woods in the world, along with African blackwood, pink ivory, agarwood and ebony. [24] [25]

Sandalwood has historically been an important tree in the development of the political economy of the Pacific. Prior to colonization in the region, the sandalwood tree was a marker of status, rank and beauty. It then became an important part of the Pacific trade during the colonial period, as it was one of the few resources the West was able to successfully trade with Chinese merchants. This western trade began to put pressure on the production of sandalwood in the region. [26]

Tonga, a Polynesian kingdom in the Oceania region, saw a severe depletion of its sandalwood tree (locally known as “‘ahi”) due a disruption of the social hierarchy, known as “fahu”, which led to heightened local competition and eventually an over harvest. Nearly all of the sandalwood resources were depleted over the span of two years. [27]

Tongan people have a unique social dynamic referred to as “fahu.” On the one hand, the kinship system of fahu is able to ensure biodiversity and sustainability in contemporary Tonga. But on the other hand, a principal factor in the over harvest of the ‘ahi tree was the result of the defensive actions of farmers defying fahu customs. As sandalwood became valuable in the market, lower-ranking family members began to harvest the trees without permission, encouraging many farmers to harvest their trees defensively and thus leading to over harvest. [28]

In 2007, Mike Evans published a scholarly report on Tongan sandalwood overharvest and the socio-environmental implications of resource commodification and privatized land tenure. Evan’s concluded that “whatever the short-term ecological benefits of enforcing privatized land tenure, because private property not only fragments social ties by allowing an individual to deny others, it has the potential to fragment the regional ecology as well.” [29]

Uses

Fragrance

Sandalwood (S. album) essential oil SandalwoodEssOil.png
Sandalwood (S. album) essential oil

Sandalwood oil has a distinctive soft, warm, smooth, creamy, and milky precious-wood scent. Its quality and scent profile is greatly influenced by the age of the tree, location and the skill of the distiller. It imparts a long-lasting, woody base to perfumes from the oriental, woody, fougère, and chypre families, as well as a fixative to floral and citrus fragrances. When used in smaller proportions in a perfume, it acts as a fixative, enhancing the longevity of other, more volatile, materials in the composite. Sandalwood is also a key ingredient in the "floriental" (floral-ambery) fragrance family – when combined with white florals such as jasmine, ylang ylang, gardenia, plumeria, orange blossom, tuberose, etc.

Sandalwood oil in India is widely used in the cosmetic industry. The main source of true sandalwood, S. album, is a protected species, and demand for it cannot be met. Many species of plants are traded as "sandalwood". The genus Santalum has more than 19 species. Traders often accept oil from closely related species, as well as from unrelated plants such as West Indian sandalwood ( Amyris balsamifera ) in the family Rutaceae or bastard sandalwood (Myoporum sandwicense, Myoporaceae). However, most woods from these alternative sources lose their aroma within a few months or years.

Isobornyl cyclohexanol is a synthetic fragrance chemical produced as an alternative to the natural product.

Sandalwood's main components are the two isomers of santalol (about 75%). It is used in aromatherapy and to prepare soaps. [30]

Idols/sculptures

Sandalwood lends itself well to carving and has thus, traditionally, been a wood of choice for statues and sculptures of Hindu gods.

Technology

Due to its low fluorescence and optimal refractive index, sandalwood oil is often employed as an immersion oil within ultraviolet and fluorescence microscopy.

Food

Aboriginal Australians eat the seed kernels, nuts, and fruit of local sandalwoods, such as the quandong (S. acuminatum). [31] Early Europeans in Australia used quandong in cooking damper by infusing it with its leaves, and in making jams, pies, and chutneys from the fruit. [31] In Scandinavia, pulverised bark from red sandalwood ( Pterocarpus soyauxii ) is used - with other tropical spices - when marinating anchovies and some types of pickled herring such as matjes , sprat, and certain types of traditional spegesild, inducing a reddish colour and slightly perfumed flavour. [32] [33] [34]

Present-day chefs have begun experimenting in using the nut as a substitute for macadamia nuts or a bush food substitute for almonds, hazelnuts, and others in Southeast Asian-styled cuisine. [35] The oil is also used as a flavour component in different food items, including candy, ice cream, baked food, puddings, alcoholic and nonalcoholic beverages, and gelatin. The flavouring is used at levels below 10 ppm, the highest possible level for use in food products being 90 ppm.

Distillation

Oil is extracted from Sandalwood through distillation. Many different methods are used, including steam distillation, water distillation, CO2 extraction, and solvent extractions. Steam distillation is the most common method used by sandalwood companies. It occurs in a four-step process, incorporating boiling, steaming, condensation, and separation. Water is heated to high temperatures (60–100 °C or 140–212 °F) and is then passed through the wood. The oil is very tightly bound within the cellular structure of the wood, but can be released by the high heat of the steam. The mixture of steam and oil is then cooled and separated so that the essential oil can be collected. This process is much longer than any other essential oil's distillation, taking 14 to 36 hours to complete, but generally produces much higher quality oil. Water, or hydro, distillation is the more traditional method of sandalwood extraction which involves soaking the wood in water and then boiling it until the oil is released. [36] This method is not used as much anymore because of the high costs and time associated with heating large quantities of water. [37]

Religion

Hinduism

Sandalwood carved statue of Ganesha Ganesh in legno di sandalo.jpg
Sandalwood carved statue of Ganesha

Sandalwood is considered sacred in the Hindu Ayurveda and is known in Sanskrit as chandana. [38] The wood is used for worshipping the deities, and it is said that Lakshmi (Sri), the goddess of well-being, lives in the sandalwood tree; therefore, it is also known as Srigandha.

Sandalwood paste is prepared by grinding a piece of dry sandalwood into powder, against a stone slab. With the gradual addition of water, a thick paste forms, (called kalabham "കളഭം" in Malayalam language and gandha ಗಂಧ in Kannada) and it is mixed with saffron or other such pigments to make chandanam. Chandanam, further mixed with herbs, perfumes, pigments, and some other compounds, results in javadhu. Kalabham, chandanam, and javadhu are dried and used as kalabham powder, chandanam powder, and javadhu powder, respectively. Chandanam powder is very popular in India and is also used in Nepal.

In Tirupati, after religious tonsure, sandalwood paste is applied to protect the skin. In Hinduism and Ayurveda, sandalwood is thought to bring one closer to the divine. Thus, it is one of the most used holy elements in Hindu and Vedic societies. [39] [40] This paste is integral to rituals and ceremonies, for making religious utensils, for decorating sacred images, and it is believed to calm the mind during meditation and prayer. It is also distributed to devotees, who apply it to their foreheads or necks and chests. [41] Sandalwood paste is used for most pujas both in temples and private households.

Jainism

Mahamastakabhisheka at Shravanabelagola Mahamastakabhisheka in 2006.jpg
Mahamastakabhisheka at Shravanabelagola

Sandalwood use is an integral part of the daily practices of Jainism. Sandalwood paste mixed with saffron is used to worship the Tirthankaras of Jainism. Sandalwood powder is showered as blessings by Jain monks and nuns (sadhus and sadhvis) onto their disciples and followers. Sandalwood garlands are used to dress the body during Jain cremation ceremonies. During the festival of Mahamastakabhisheka that is held once in every 12 years, the Gommateshwara statue is bathed and anointed with libations such as milk, sugarcane juice, and saffron paste, and sprinkled with powders of sandalwood, turmeric, and vermilion. [42]

Buddhism

Sandalwood is mentioned in various suttas of the Pāli Canon. [43] In some Buddhist traditions, sandalwood is considered to be of the padma (lotus) group and attributed to Amitabha Buddha. Sandalwood scent is believed by some to transform one's desires and maintain a person's alertness while in meditation. [44] It is also one of the most popular scents used when offering incense to the Buddha and the guru.

Sufism

In the Indian variants of Sufism , sandalwood paste is applied on a revered Sufi's grave by the disciples as a mark of devotion. The tradition is practiced particularly by devotees in the Indian Subcontinent. In Tamil culture, irrespective of one's religious identity, sandalwood paste or powder is applied to the graves of Sufi saints as a mark of devotion and respect. [45] [46] [47]

East Asian religions

In East Asia, sandalwood (檀木), is the most commonly used incense material by the Chinese, Korean and Japanese in worship and various ceremonies. Some Taoist sects, following the Ming Dynasty Taoist Manual, avoid the use of sandalwood (as well as benzoin resin and frankincense) as incense in worship. [48] In Korean Shamanism, sandalwood is considered the Tree of Life. It was transmitted to China, the Korean Peninsula, and Japan during the eastward expansion of Buddhism. [9] : 3 

Zoroastrianism

Zoroastrians offer sandalwood twigs to the afarganyu, the urn in which the fire is kept at the fire temple (called agiyari in Gujarati and dar-e mehr in Persian), to keep the fire burning during religious ceremonies. After the firekeeping priests complete the ceremony, attendees are allowed to come up to the afarganyu and place their own pieces of sandalwood into the fire. Fire has been a sacred symbol in the Zoroastrian religion since ancient times and it is considered very important to keep the fires in the temples constantly burning. Because of its high sensitivity to fire, sandalwood works very well for this. Also, the wood has been accepted by the Yasna and Yashts (sacred texts) as an appropriate fuel for the fire. It is offered to all of the three grades of fire in the fire temple, including the Atash Dadgahs. Sandalwood is not offered to the divo, a smaller lamp that is kept in the homes of Zoroastrians. Often, money is offered to the mobad (priest) as payment, along with sandalwood. Sandalwood is called sukhad in the Zoroastrian community. The sandalwood in the fire temple is often more expensive to buy than at a Zoroastrian store. It is often a source of income for the fire temple.[ citation needed ]

See also

Related Research Articles

<span class="mw-page-title-main">Incense</span> Material that releases fragrant smoke when burnt

Incense is an aromatic biotic material that releases fragrant smoke when burnt. The term is used for either the material or the aroma. Incense is used for aesthetic reasons, religious worship, aromatherapy, meditation, and ceremony. It may also be used as a simple deodorant or insect repellent.

<i>Santalum</i> Genus of flowering plant in the mistletoe family Santalaceae

Santalum is a genus of woody flowering plants in the Santalaceae family, the best known and commercially valuable of which is the Indian sandalwood tree, S. album. Members of the genus are trees or shrubs. Most are root parasites which photosynthesize their own food, but tap the roots of other species for water and inorganic nutrients. Several species, most notably S. album, produce highly aromatic wood, used for scents and perfumes and for herbal medicine. About 25 known species range across the Indomalayan, Australasian, and Oceanian realms, from India through Malesia to the Pacific Islands, as far as Hawaiʻi and the Juan Fernández Islands off the coast of South America.

<span class="mw-page-title-main">Agarwood</span> Fragrant wood of some Thymelaeoideae

Agarwood, aloeswood, eaglewood,gharuwood or the Wood of Gods, most commonly referred to as oud or oudh, is a fragrant, dark and resinous wood used in incense, perfume, and small hand carvings. It is formed in the heartwood of Aquilaria trees after they become infected with a type of Phaeoacremonium mold, P. parasitica. The tree defensively secretes a resin to combat the fungal infestation. Prior to becoming infected, the heartwood is mostly lacking in scent, and is relatively light and pale in coloration. However, as the infection advances, and the tree produces its fragrant resin as a final option of defense, the heartwood becomes very dense, dark, and saturated with resin. This product is harvested, and most famously referred to in cosmetics under the scent names of oud, oodh or aguru; however, it is also called aloes, agar, as well as gaharu or jinko. With thousands of years of known use, and valued across Muslim, Christian, and Hindu communities, oud is prized in Middle Eastern and South Asian cultures for its distinctive fragrance, utilized in colognes, incense and perfumes.

<i>Santalum spicatum</i> Australian sandalwood

Santalum spicatum, the Australian sandalwood, also Waang and other names (Noongar) and Dutjahn (Martu), is a tree native to semi-arid areas at the edge of Southwest Australia, in the state of Western Australia. It is also found in South Australia, where it is protected and listed as a vulnerable species. It is traded as sandalwood, and its sandalwood oil has been used as an aromatic and a food source over history. S. spicatum is one of four Santalum species occurring in Australia.

<span class="mw-page-title-main">Incense in Japan</span>

The burning of incense in Japan began during the 6th century with the introduction of Buddhism, which uses incense during rituals and ceremonies. Agarwood was imported into Japan from China via Korea. From that point on, incense would become an important facet of Japanese culture. Incense is used for a variety of purposes, including Buddhist ceremonies, spirituality and meditation.

<span class="mw-page-title-main">Incense in India</span>

India is the world's main incense producing country, and is a major exporter to other countries. In India, incense sticks, called Agarbatti (Agar: from Dravidian probably Tamil அகில், அகிர் ., Sanskrit varti, meaning "stick" An older term "Dhūpavarti" is more commonly used in ancient and medieval texts which encompasses various types of stick incense recipes. Incense is part of the cottage industry in India and important part of many religions in the region since ancient times. The method of incense making with a bamboo stick as a core originated in India at the end of the 19th century, largely replacing the rolled, extruded or shaped method which is still used in India for dhoop.

<i>Santalum album</i> Species of tree in Sandalwood family

Santalum album, or Indian sandalwood, is a small tropical tree, and the traditional source of sandalwood oil. It is native to southern India and Southeast Asia. It is considered sacred in some religions like Hinduism, and some cultures place great significance on its fragrant qualities. However, the high value of the species has caused over-exploitation, to the point where the wild population is vulnerable to extinction. Indian sandalwood still commands high prices for its essential oil owing to its high alpha santalol content, but due to lack of sizable trees it is no longer used for fine woodworking as before. The plant is long-lived, but harvest is only viable after many years.

<i>Pterocarpus santalinus</i> Species of legume

Pterocarpus santalinus, with the common names red sanders, red saunders, Yerra Chandanam, Chenchandanam, red sandalwood, Rakta Chandana, and saunderswood, is a species of Pterocarpus endemic to the southern Eastern Ghats mountain range of South India. This tree is valued for the rich red colour of its wood, and in recent years there has been a marked uptick in the use of red sandalwood as a component of incense, especially in the west. The tree is not to be confused with the aromatic Santalum sandalwood trees that grow natively in Southern India.

<i>Santalum haleakalae</i> Species of tree

Santalum haleakalae, known as Haleakala sandalwood or ʻIliahi in Hawaiian, is a species of flowering tree in the sandalwood family, that is endemic to the islands of Maui, Lanai, and Molokai in the Hawaiian Islands, part of the United States. It grows in subalpine shrublands at elevations of 1,900 to 2,700 m, especially on the slopes of Haleakalā.

β-Santalol Chemical compound

β-Santalol is an organic compound that is classified as a sesquiterpene. It comprises about 20% of the oil of sandalwood, the major component being α-santalol. In 2002, about 60 tons of sandalwood oil were produced by steam distillation of the heartwood of Santalum album.

α-Santalol Chemical compound

α-Santalol, also referred to as alpha-santalol, is an organic compound that is classified as a sesquiterpene. It comprises about 55% of the oil of sandalwood, another less abundant component being β-santalol. As of 2002, about 60 tons of sandalwood oil are produced annually by steam distillation of the heartwood of Santalum album. It is a valued component for perfumes.

Sandalwood is the common name of many species of plants and their wood and oils.

<span class="mw-page-title-main">Sandalwood oil</span> Essential oil

Sandalwood oil is an essential oil obtained from the steam distillation of chips and billets cut from the heartwood of various species of sandalwood trees, mainly Santalum album and Santalum spicatum.

<i>Santalum freycinetianum</i> Species of tree

Santalum freycinetianum, the forest sandalwood, Freycinet sandalwood, or ʻIliahi, is a species of flowering tree in the European mistletoe family, Santalaceae, that is endemic to the Hawaiian Islands. Its binomial name commemorates Henri Louis Claude de Saulces de Freycinet, a 19th-century French explorer. ʻIliahi inhabits dry, coastal mesic, mixed mesic, and wet forests on Oʻahu, Kauaʻi, Lānaʻi, Maui, and Molokaʻi at elevations of 250–950 m (820–3,120 ft). It grows in areas that receive 500–3,800 mm (20–150 in) of annual rainfall. Like other members of its genus, ʻiliahi is a root hemi-parasite, deriving some of its nutrients from the host plant; common hosts include koa, koaiʻa, and ʻaʻaliʻi.

<i>Osyris compressa</i> Species of flowering plant in the mistletoe family Santalaceae

Osyris compressa is a facultatively hemiparasitic, mainly South African plant of the sandalwood family, Santalaceae. Until recently, the favoured binomial name was Colpoon compressum, but around 2001, the genus Colpoon was included in Osyris on the basis of comparative DNA studies. That assignment is not final, however, and according to the Kew Gardens plant list, Colpoon compressum P.J.Bergius, though still in review, is the accepted name.

Sesbania rostrata is a small semi-aquatic leguminous tree, in the genus Sesbania. It forms a symbiotic relationship with Gram-negative rhizobia which leads to the formation of nitrogen fixing nodules on both stem and roots. It is mainly used as green manure to improve soil fertility due to its fast growth, high biomass production and ability to convert large amounts of atmospheric nitrogen into a usable form for plants. Other applications include production of high quality forage for livestock and it is a source of fuel-wood.

<i>Albizia amara</i> Species of legume

Albizia amara is a tree in the family Fabaceae. Its range includes southern and Eastern Africa, from South Africa to Sudan and Ethiopia. It is also found in India and Sri Lanka.

Osyris daruma is a species of plant in the family Santalaceae.

<span class="mw-page-title-main">Mysore Sandalwood Oil</span>

Mysore Sandalwood Oil is a trademarked perfume oil extracted from the Santalum album variety of sandalwood tree in the Mysore district of Karnataka, India. The tree species is said to be one of the best varieties in the world.

<i>Albizia procera</i> Species of tree

Albizia procera, commonly known as white siris or karoi tree, is a species of large tree found natively in southeast Asia and India. It is most commonly found in open forests, but may also be found on the margins of rain forests and in monsoon and gallery forests. It is considered an invasive species in South Africa.

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  36. ↑ Zhang, Qing-Wen; Lin, Li-Gen; Ye, Wen-Cai (2018-04-17). "Techniques for extraction and isolation of natural products: a comprehensive review". Chinese Medicine. 13: 20. doi: 10.1186/s13020-018-0177-x . ISSN   1749-8546. PMC   5905184 . PMID   29692864.
  37. ↑ "Getting into Hot Water: A Practical Guide to Hot-Water Heating Systems | NC State Extension Publications". content.ces.ncsu.edu. Retrieved 2022-04-28.
  38. ↑ "Significance of Sacred Sandalwood Chandan in Ayurvedic Remedies, Spiritual Rituals and Medicine". ayurveda-sedona.com. Retrieved 2017-04-05.
  39. ↑ C, Sandeep & TN, Manohara. (2019). Sandalwood in India: Historical and cultural significance of Santalum album L. as a basis for its conservation. NeBIO. 10. 235-242.
  40. ↑ López-Sampson, Arlene; Page, Tony (2018-03-01). "History of Use and Trade of Agarwood". Economic Botany. 72 (1): 107–129. doi:10.1007/s12231-018-9408-4. ISSN   1874-9364. S2CID   255560778.
  41. ↑ "Sandalwood - spiritual". Kew.org. Archived from the original on 10 May 2013. Retrieved 17 April 2018.
  42. ↑ Kumar, Brajesh (2003), Pilgrimage Centres of India, Diamond Pocket Books (P) Ltd., p. 199, ISBN   9788171821853
  43. ↑ "Access to Insight Search Results". Accesstoinsight.org. Retrieved 17 April 2018.
  44. ↑ Pullaiah, Thammineni, Sudhir Chandra Das, Vishwas A Bapat, Mallappa Kumara Swamy, Vaddi Damodar Reddy, and Kongdragunta Sri Rama Murthy. “History of Sandalwood.” In Sandalwood: Silviculture, Conservation and Applications, 9–20. Singapore: Springer, 2021.
  45. ↑ "Now, All roads lead to Mumbai's Mahim Dargah fair". dnaindia.com. 18 December 2011. Retrieved 21 April 2013.
  46. ↑ Khubchandani, Lachman K. (1995). "The supernatural in nature Sindhi tradition". Indira Gandhi National Centre for the Arts. Archived from the original on 2013-05-26. Retrieved 21 April 2013.
  47. ↑ Bayly, Susan (2004). Saints, Goddesses and Kings. Cambridge University Press. pp. 144–147. ISBN   9780521891035 . Retrieved 21 April 2013.
  48. ↑ The Ming Dynasty Taoist manual 《天皇至道太清玉冊》 states: 「降真香，乃祀天帝之靈香也。除此之外，沉速次之。信靈香可以達天帝之靈。所忌者，安息香、乳香、檀香，外夷所合成之香，天律有禁，切宜慎之。」 ["Acronychia pedunculata is the spiritual incense of offering to the Heavenly Emperor. Apart from this type, agarwood/aloeswood (Aquilaria malaccensis) then Aquilaria sinensis are the next best. It is believed that this spiritual incense can ascend to reach the spirit of the Heavenly Emperor. Those that are to be avoided are benzoin resin, frankincense, sandalwood, foreign produced incense that violate the Heavenly Law and so one must be careful to observe this."]

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