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.
Cooks in Europe and the U.S prefer to call these noodles as cellophane noodles as they become transparent like cellophane (sticking) tape when cooked! Cellophane noodles are made from green mung beans, the beans are polished before use and that is why you do not see the greenish color on these transparent noodles. At times if you observe the entire bunch of cellophabe noodles when unpacked, you might notice some green fragments stuck to the noodles.