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.
A sarcophagus (plural, sarcophagi; sarcophaguses) is a box-like funeral receptacle for a corpse, most commonly carved in stone, and displayed above ground, though it may also be buried.dded to the basin-like main sarcophagi is a broad, rectangular frame, often covered with a white slip and then painted. The huge Lycian Tomb of Payava, now in the British Museum, is a royal tomb monument of about 360 BC designed for an open-air placing, a grand example of a common Lycian style.