The conservation and restoration of outdoor artworks is the activity dedicated to the preservation and protection of artworks that are exhibited or permanently installed outside. These works may be made of wood, stone, ceramic material, plastic, bronze, copper, or any other number of materials and may or may not be painted. When applied to cultural heritage this activity is generally undertaken by a conservator-restorer.
Unlike many works of cultural heritage, outdoor artworks are not exhibited in a controlled environment, where temperature and relative humidity are closely monitored. Though works may be more easily preserved in a controlled environment, they are installed outside to preserve the artist's intent, and avoid decontextualization. [1] Instead, outdoor works are exposed to many and various environmental factors depending upon its geographic or site location and its configuration. [2]
Environmental threats may include, but are not limited to rain, snow, acid rain, and earthquakes as well as fluctuations in temperature and relative humidity. They may also be exposed to excessive amounts of light as well as human intervention. Excessive rain and moisture can also lead to mold growth. Daily exposure to ultraviolet, visible, and infrared (IR) radiation has a detrimental effect on painted sculptures or those with organic or inorganic coatings. Excessive light exposure may cause color alterations and loss as well as structural breakdowns in the paint and coatings. [3]
Air pollution can also adversely affect outdoor artworks. In addition to meteorological conditions, traditional outdoor pollutants including sulfur dioxide, nitrogen oxides, and ozone affect the various composite materials. [4] The specific level and type of air pollution degradation is dependent on the material and composition of the artwork as well as the length of exposure. Organic carbonyl pollutants are also an increasing threat due increased use of ethanol based fuels. [4]
Though specific conservation methods are dependent on the material, condition, and environment for each artwork, there are some standard practices for outdoor works. These include condition assessment, treatment, preventive conservation, and maintenance.
Before any conservation treatment, a thorough condition assessment with written and photographic documentation is completed. This initial assessment may include research into the artist's working techniques or a discussion with the living artist, review of the conservation history of the object, and non-destructive analysis.
According to Virginia Naudé and Glenn Wharton, there are four steps that come with the assessment or survey of an outdoor sculpture: [5]
The treatment of outdoor artworks is multifaceted and dependent on the material type, condition, structural integrity, and exhibition conditions. A brief overview of conservation treatments by material is outlined below, and more thorough discussions are available on the individual conservation pages.
Preventive conservation involves actions taken to delay deterioration of cultural heritage. For outdoor artworks, this usually involves the application of a protective coating and regular maintenance. The particular protective coating is chosen based on its durability, adhesion to the surface, ease of maintenance, and surface appearance on the work. [2] The coating provides some protection from environmental factors, but must be occasionally be reduced and reapplied for best results. A long-term conservation schedule should be created and implemented to ensure the longevity of the artwork. A maintenance walk-through schedule should also be established to routinely check the condition of the objects. This may be a weekly procedure; it is useful as conservators can assess and document any damage caused by visitors or environmental conditions, and may rinse and wipe down sculptures. [3]
This section is an abbreviated list. For the detailed list, please refer to the conservation and restoration of outdoor bronze sculptures.
With respect to cultural property, conservation science is the interdisciplinary study of the conservation of art, architecture, technical art history and other cultural works through the use of scientific inquiry. General areas of research include the technology and structure of artistic and historic works. In other words, the materials and techniques from which cultural, artistic and historic objects are made.
A conservator-restorer is a professional responsible for the preservation of artistic and cultural artifacts, also known as cultural heritage. Conservators possess the expertise to preserve cultural heritage in a way that retains the integrity of the object, building or site, including its historical significance, context and aesthetic or visual aspects. This kind of preservation is done by analyzing and assessing the condition of cultural property, understanding processes and evidence of deterioration, planning collections care or site management strategies that prevent damage, carrying out conservation treatments, and conducting research. A conservator's job is to ensure that the objects in a museum's collection are kept in the best possible condition, as well as to serve the museum's mission to bring art before the public.
Conservation and restoration of metals is the activity devoted to the protection and preservation of historical and archaeological objects made partly or entirely of metal. In it are included all activities aimed at preventing or slowing deterioration of items, as well as improving accessibility and readability of the objects of cultural heritage. Despite the fact that metals are generally considered as relatively permanent and stable materials, in contact with the environment they deteriorate gradually, some faster and some much slower. This applies especially to archaeological finds.
The conservation and restoration of silver objects is an activity dedicated to the preservation and protection of objects of historical and personal value made from silver. When applied to cultural heritage this activity is generally undertaken by a conservator-restorer.
Conservation and restoration of ceramic objects is a process dedicated to the preservation and protection of objects of historical and personal value made from ceramic. Typically, this activity of conservation-restoration is undertaken by a conservator-restorer, especially when dealing with an object of cultural heritage. Ceramics are created from a production of coatings of inorganic, nonmetallic materials using heating and cooling to create a glaze. These coatings are often permanent and sustainable for utilitarian and decorative purposes. The cleaning, handling, storage, and in general treatment of ceramics is consistent with that of glass because they are made of similar oxygen-rich components, such as silicates. In conservation ceramics are broken down into three groups: unfired clay, earthenware or terracotta, and stoneware and porcelain.
Iron, steel, and ferrous metals constitute a large portion of collections in museums. The conservation and restoration of iron and steel objects is an activity dedicated to the preservation and protection of objects of historical and personal value made from iron or steel. When applied to cultural heritage this activity is generally undertaken by a conservator-restorer. Historically, objects made from iron or steel were created for religious, artistic, technical, military and domestic uses. Though it is generally not possible to completely halt deterioration of any object, the act of conservation and restoration strives to prevent and slow the deterioration of the object as well as protecting the object for future use. One of the first steps in caring for iron is to examine them and determine their state, determine if they are corroding, and consider options for treatment.
The conservation and restoration of outdoor bronze artworks is an activity dedicated to the preservation, protection, and maintenance of bronze objects and artworks that are on view outside. When applied to cultural heritage this activity is generally undertaken by a conservator-restorer.
A paintings conservator is an individual responsible for protecting cultural heritage in the form of painted works of art. These individuals are most often under the employ of museums, conservation centers, or other cultural institutions. They oversee the physical care of collections, and are trained in chemistry and practical application of techniques for repairing and restoring paintings.
The conservation and restoration of books, manuscripts, documents, and ephemera is an activity dedicated to extending the life of items of historical and personal value made primarily from paper, parchment, and leather. When applied to cultural heritage, conservation activities are generally undertaken by a conservator. The primary goal of conservation is to extend the lifespan of the object as well as maintaining its integrity by keeping all additions reversible. Conservation of books and paper involves techniques of bookbinding, restoration, paper chemistry, and other material technologies including preservation and archival techniques.
An Objects conservator is a professional, working in a museum setting or private practice, that specializes in the conservation of three-dimensional works. They undergo specialized education, training, and experience that allows them to formulate and implement preventive strategies and invasive treatment protocols to preserve cultural property for the future. Objects conservators typically specialize in one type of material or class of cultural property, including metals, archaeological artifacts, ethnographic artifacts, glass, and ceramic art. Objects conservation presents many challenges due to their three-dimensional form and composite nature.
The Prophet (4/7) is a public artwork by Spanish artist Pablo Gargallo, located in the Alan and Janet Wurtzburger Sculpture Garden at The Baltimore Museum of Art, which is in Baltimore, MD, United States. This bronze sculpture was created in 1933, using the sand casting method, and depicts an abstract male figure with his right arm bent towards the sky and holding a staff in his left hand.
A photograph conservator is a professional who examines, documents, researches, and treats photographs, including documenting the structure and condition of art works through written and photographic records, monitoring conditions of works in storage and exhibition and transit environments. This person also performs all aspects of the treatment of photographs and related artworks with adherence to the professional Code of Ethics.
The conservation and restoration of wooden furniture is an activity dedicated to the preservation and protection of wooden furniture objects of historical and personal value. When applied to cultural heritage this activity is generally undertaken by a conservator-restorer. Furniture conservation and restoration can be divided into two general areas: structure and finish. Structure generally relates to wood and can be divided into solid, joined, and veneered wood. The finish of furniture can be painted or transparent.
The conservation and restoration of totem poles is a relatively new topic in the field of art conservation. Those who are custodians of totem poles include Native American communities, museums, cultural heritage centers, parks or national parks, camp grounds or those that belong to individuals. Conservation activities include the historical research and context of totem poles, studying materials and manufacture, performing assessments, documentation and treatments. This field can pertain to conservator-restorers, Native Americans, curators, collection managers, registrars, park rangers and city planners.
The conservation and restoration of painting frames is the process through which picture frames are preserved. Frame conservation and restoration includes general cleaning of the frame, as well as in depth processes such as replacing damaged ornamentation, gilding, and toning.
The conservation and restoration of outdoor murals is the process of caring for and maintaining murals, and includes documentation, examination, research, and treatment to insure their long-term viability, when desired.
The conservation and restoration of paintings is carried out by professional painting conservators. Paintings cover a wide range of various mediums, materials, and their supports. Painting types include fine art to decorative and functional objects spanning from acrylics, frescoes, and oil paint on various surfaces, egg tempera on panels and canvas, lacquer painting, water color and more. Knowing the materials of any given painting and its support allows for the proper restoration and conservation practices. All components of a painting will react to its environment differently, and impact the artwork as a whole. These material components along with collections care will determine the longevity of a painting. The first steps to conservation and restoration is preventive conservation followed by active restoration with the artist's intent in mind.
The conservation and restoration of ancient Greek pottery is a sub-section of the broader topic of conservation and restoration of ceramic objects. Ancient Greek pottery is one of the most commonly found types of artifacts from the ancient Greek world. The information learned from vase paintings forms the foundation of modern knowledge of ancient Greek art and culture. Most ancient Greek pottery is terracotta, a type of earthenware ceramic, dating from the 11th century BCE through the 1st century CE. The objects are usually excavated from archaeological sites in broken pieces, or shards, and then reassembled. Some have been discovered intact in tombs. Professional conservator-restorers, often in collaboration with curators and conservation scientists, undertake the conservation-restoration of ancient Greek pottery.
The conservation-restoration of panel paintings involves preventive and treatment measures taken by paintings conservators to slow deterioration, preserve, and repair damage. Panel paintings consist of a wood support, a ground, and an image layer. They are typically constructed of two or more panels joined together by crossbeam braces which can separate due to age and material instability caused by fluctuations in relative humidity and temperature. These factors compromise structural integrity and can lead to warping and paint flaking. Because wood is particularly susceptible to pest damage, an IPM plan and regulation of the conditions in storage and display are essential. Past treatments that have fallen out of favor because they can cause permanent damage include transfer of the painting onto a new support, planing, and heavy cradling. Today's conservators often have to remediate damage from previous restoration efforts. Modern conservation-restoration techniques favor minimal intervention that accommodates wood's natural tendency to react to environmental changes. Treatments may include applying flexible battens to minimize deformation or simply leaving distortions alone, instead focusing on preventive care to preserve the artwork in its original state.
The Modern and Contemporary Art Research Initiative is a program started by the Getty Conservation Institute (GCI). It began in 2007 in response to the variety of new materials and technologies being used by contemporary artists in their work, and the lack of known conservation treatments for these new materials. This area was seen as a gap in the field of conservation, but also posed unique challenges when considering the intention of the artist and the physical aging that his or her materials might endure. According to Thomas F. Reese, "Conservators...must enter into the critical spirit of the works themselves if they are to save and transmit not merely decontextualized fragments but their essence to the future."