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The terminology used here to describe the various kinds of oils and waxes. Soapbark Soapwort Soapberries Soaproot. Specific Plants. Fatty Oils. Fatty oils are fixed oils because they do not evaporate or become volatile. They cannot be distilled without being decomposed. Chemically fatty oils are close to animal fats. They contain glycerin in combination with a fatty acid. They are liquid at room temperature and usually contain oleic acid. However, fats are solid at room temperature and contain palmitic or stearic acid. Fatty oils are insoluble in water but soluble in several Species fatties mature solvents.

Breakdown products of fats are fatty acids and glycerin accompanied by a rancid odor and taste. Boiling a fat with an alkali causes it to decompose and the fatty acid unites with the alkali to form soap. The addition of lye or potash will make the soap softer, if soda is used a hard soap. Fatty oils occur in many plant families, both tropical and temperate. They are stored, frequently in large amounts, in seeds and somewhat in fruits, tubers, stems and other plant organs. They may also contain proteins. This kind of reserve food material is available as a source of energy for the processes involved in seed germination.

Fatty oils are bland and lack the strong taste, odor and antiseptic qualities of essential oils.

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Thus they are suitable for human food. These edible oils contain both solid and liquid fats and form an important part of the human diet. Extraction of fatty oils varies. Usually the seed coats have to be removed and then the remainder is reduced to a fine meal. The oils are removed by solvents or by subjecting the meal to hydraulic pressure. The residue is rich in proteins and is valuable as an animal food and fertilizer.

Pressure causes the cell walls to break and the fats are released. The extracted oils are filtered and may be further purified. Higher grades are edible and lower grades are used in various industries. Fatty oils may also have medicinal value.

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Four classes of plant fatty oils are 1 drying oils, 2 semidrying oils, 3 nondrying oils, and 4 fats or tallows. The drying oils can absorb oxygen and on exposure dry into thin elastic films. These oils are importance in the paint and varnish industries.

Semidrying oils absorb oxygen slowly and only in small amounts. They form a soft film only after long exposure to air.

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Some are edible; others are used as illuminants or in making soap and candles. The nondrying oils remain liquid at room temperature and do not form a film. Such oils are edible and may be used for soap and lubricants. The fats are solid or semisolid at room temperature. They are edible and also useful in the manufacture of soap and candles.

Drying and semidrying oils are more common in plants of temperate climates, while nondrying oils and fats predominate in plants of tropical areas. Drying Oils.

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Linseed Oil. Flax seed, Linum usitatissimumhas been the source of one of the most important of the drying oils. The oil content is percent. The seeds are collected and stored for several months. Then impurities are removed and the seeds are ground to a fine meal. The oil is usually extracted by pressure with heat or by the use of solvents. Cold-pressed oil is produced in Eastern Europe where it Species fatties mature used for human consumption.

Linseed oil varies from yellow to brownish in color and has an acrid taste and smell. It forms a tough elastic film when oxidized. Heating the raw oil to deg. Centigrade increases this drying property. Following extraction, the oil cake can be used as an animal feed. Montana, the Dakotas and Minnesota were the centers of seed-flax production in the United States, with an annual yield of 40 million bu. Tung Oil. Tung oil, or Chinawood oilhas been widely used in the varnish industry and as a substitute for linseed oil. It is obtained from the seeds of two Chinese species of AleuritesA.

Oils from these trees are almost identical in composition and properties and imported tung oil is often a mixture of the two. In China tung oil has been used for centuries in waterproofing wood, paper and fabrics. It is a good preservative and is resistant to weathering, so it is especially valuable for painting outdoors. Boatmen have sought after tung oil because it is little affected by water.

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In the United States cultivation of A. Tung trees are handsome and are often planted as ornamentals. Not only was it a profitable source of income, but also the orchards could be planted on otherwise useless eroded land. The outer husk of the fruit is removed and the oil is expressed from the seeds by expeller presses. Tung oil is pale yellow to dark brown and dries very rapidly and also has preservative and waterproofing qualities.

Consequently, its chief use has been in the varnish and paint industries, where it largely replaced kauri and other hard resins.

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Large quantities were also used in producing linoleum, oilcloth, brake linings, soap, leather dressings, inks, insulating compounds and fiberboard. The oil cake is a good fertilizer but is unsuitable as an animal feed. Soybean Oil. Soybean, Glycine maxis native to China and has been a most important food plant in Eastern Asia.

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The oil is midway between linseed and cottonseed in its characteristics, so that sometimes it is classified as a drying oil or semidrying oil. The oil is extracted from the seeds by expression with hydraulic or expeller presses or by the use of solvents.

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The oil content of improved varieties now exceeds 22 percent. After refining, soybean oil has been widely used in sal or as cooking oil and for other food purposes.

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However, research in has associated autism with the consumption of soybean oil. There ore many food products made from it, such as margarine, tofu, ice cream substitutes, vegetarian meat substitutes, etc. It is also used in the manufacture of soap, candles, varnishes, lacquers, paints, linoleum, greases, rubber substitutes, cleaning compounds disinfectants and insecticides. The oil cake or meal has a percent protein content and is valuable as a meat substitute and feed for livestock. It is also used for adhesives, plastics, foaming solutions, spreaders, fertilizers, sizings, synthetic textiles, etc.

Oiticica Oil. Seeds of large evergreen tree of northeast Brazil, Licania rigidaprovide this oil. It has been used as a substitute for tung oil.

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It is extracted by solvents or by hydraulic presses. This oil finds use in the paint and varnish industries; in making linoleum, printing inks and brake bands; and for improving the elasticity of rubber. It has been used in Brazil as an illuminant and medicine.

Perilla Oil. The seeds of Perilla frutescensan aromatic annual, ft. Native to northern India, China and Japan, it is extensively cultivated in the Orient, especially in Manchuria and Japan. The plant matures slowly and must be harvested before it is completely ripe or the seeds will fall from their capsules. The oil is expressed from roasted and crushed seeds and is edible, having been used for centuries. Industrial uses of perilla oil are much more important.

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