Food Grade Glycerin is added to soap in order to produce a clear finish and extra moisturizing qualities. It can be dissolved easily into alcohol and water but not into oils.
It is also a hygroscopic which means it easily absorbs water from the surrounding air. If you were to leave some glycerin in the open, it would absorb water from the surrounding air to eventually become 20% water and 80% glycerin. If you were to place a small amount of pure glycerin on your tongue, you're tongue would blister because glycerin is dehydrating. When water is used to dilute it, however, it makes the skin soft.
Food Grade Glycerin is a thick liquid that is colorless and sweet tasting. It has a high boiling point and freezes to a paste. Glycerin's most common use is in soap and other beauty products like lotions, though it is also used, in the form of nitroglycerin, to create dynamite.
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