Semi-drying oil

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A semi-drying oil is an oil which partially hardens when it is exposed to air. This is as opposed to a drying oil, [1] which hardens completely, or a non-drying oil, which does not harden at all. Oils with an iodine number of 115–130 are considered semi-drying.

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Examples of semi-drying oils

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Related Research Articles

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Oil painting is a painting method involving the procedure of painting with pigments with a medium of drying oil as the binder. It has been the most common technique for artistic painting on canvas, wood panel or copper for several centuries, spreading from Europe to the rest of the world. The advantages of oil for painting images include "greater flexibility, richer and denser colour, the use of layers, and a wider range from light to dark". But the process is slower, especially when one layer of paint needs to be allowed to dry before another is applied.

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<span class="mw-page-title-main">Linseed oil</span> Oil obtained from the dried, ripened seeds of the flax plant

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<span class="mw-page-title-main">Drying oil</span> Oil that hardens after exposure to air

A drying oil is an oil that hardens to a tough, solid film after a period of exposure to air, at room temperature. The oil hardens through a chemical reaction in which the components crosslink by the action of oxygen. Drying oils are a key component of oil paint and some varnishes. Some commonly used drying oils include linseed oil, tung oil, poppy seed oil, perilla oil, castor oil and walnut oil. Their use has declined over the past several decades, as they have been replaced by alkyd resins and other binders.

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A non-drying oil is an oil which does not harden and remains liquid when it is exposed to air. This is as opposed to a drying oil, which hardens completely, or a semi-drying oil, which partially hardens. Oils with an iodine number of less than 115 are considered non-drying.

An oil drying agent, also known as siccative, is a coordination compound that accelerates (catalyzes) the hardening of drying oils, often as they are used in oil-based paints. This so-called "drying" occurs through free-radical chemical crosslinking of the oils. The catalysts promote this free-radical autoxidation of the oils with air.

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Tung oil or China wood oil is a drying oil obtained by pressing the seed from the nut of the tung tree. Tung oil hardens upon exposure to air, and the resulting coating is transparent and has a deep, almost wet look. Used mostly for finishing and protecting wood, after numerous coats, the finish can even look plastic-like. Related drying oils include linseed, safflower, poppy, and soybean oils. Raw tung oil tends to dry to a fine, wrinkled finish ; this property was used to make wrinkle finishes, usually by adding excess cobalt drier. To prevent wrinkling, the oil is heated to gas-proof it.

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Ampaw, ampao or arroz inflado, usually anglicized as pop rice or puffed rice, is a Filipino sweet puffed rice cake. It is traditionally made with sun-dried leftover cooked white rice that is fried and coated with syrup.

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The oil print process is a photographic printmaking process that dates to the mid-19th century. Oil prints are made on paper on which a thick gelatin layer has been sensitized to light using dichromate salts. After the paper is exposed to light through a negative, the gelatin emulsion is treated in such a way that highly exposed areas take up an oil-based paint, forming the photographic image.

References

  1. "Drying Oil - an overview | ScienceDirect Topics". www.sciencedirect.com. Retrieved 2021-09-21.