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The remaining waxy mass is known as a concrete, which is a mixture of essential oil, waxes, resins, and other lipophilic (oil-soluble) plant material, since these solvents effectively remove all hydrophobic compounds in the raw material. The solvent is then removed by a lower temperature distillation process and reclaimed for re-use.
An essential oil is a concentrated hydrophobic liquid containing volatile (easily evaporated at normal temperatures) chemical compounds from plants.Essential oils are also known as volatile oils, ethereal oils, aetheroleum, or simply as the oil of the plant from which they were extracted, such as oil of clove.
The fatty acid source also affects the soap's melting point. Most early hard soaps were manufactured using animal fats and KOH extracted from wood ash; these were broadly solid. However, the majority of modern soaps are manufactured from polyunsaturated triglycerides such as vegetable oils.
A handmade soap bar Two equivalent images of the chemical structure of sodium stearate, a typical ingredient found in bar soaps Emulsifying action of soap on oil. Soap is a salt of a fatty acid (sometimes other carboxylic acids) used for cleaning and lubricating products as well as other applications. [1]
Rose oil, [2] jasmine absolute, tuberose absolute, tobacco absolute, [3] orris root oil, ambrette seeds oil, angelica root oil, and orange flower oil are valuable and expensive fragrance and flavor ingredients. [4] Residual solvents may remain in the absolutes. Therefore, some absolutes are considered undesirable for aromatherapy. [citation needed]
Oils and the belief that they had healing properties, along with other beliefs of the time, are described by Dioscorides in his De Materia Medica, written in the 1st century A.D. [7] Distilled cedarwood oil was used by the ancient Egyptians, and the process of distilling essential oils like rose essence was refined by the 11th century Persian ...
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