Precipitation is also useful to isolate the products of a reaction during workup. Ideally, the product of the reaction is insoluble in the reaction solvent. Thus, it precipitates as it is formed, preferably forming pure crystals. An example of this would be the synthesis of porphyrins in refluxing propionic acid.
Freebase(0.00 / 0 votes)Rate this definition: Cellophane. Cellophane is a thin, transparent sheet made of regenerated cellulose. Its low permeability to air, oils, greases, bacteria and water makes it useful for food packaging.
They are generally sold in dried form, soaked to reconstitute, then used in soups, stir fried dishes, or spring rolls. They are called cellophane noodles or glass noodles because of their appearance when cooked, resembling cellophane, a clear material of a translucent light gray or brownish-gray color.