Polyvidone is used as a diluent in colour additive mixtures for marking food; in coatings on fresh citrus fruits; as a clarifying agent for beer, wine and vinegar; as a tableting adjuvant. A cross-linked form of PVP is also used as a disintegrant (see also excipients) in pharmaceutical tablets. It is also known as cross-linked polyvinyl pyrrolidone, Polyvinyl Polypyrrolidone (PVPP), crospovidone, crospolividone. Basically, PVPP is a highly cross-linked version of PVP, which makes it insoluble in water but it still absorbs water and swells very rapidly and generate a swelling force. That is why it can be used a disintegrant in tablets. It is also used to bind impurities to remove them from solutions.It is also used as a fining to extract impurities (via agglomeration followed by filtration). Using the same principle it is used to remove polyphenols in beer production and thus clear beers with stable foam are produced. PVPP can be used as well as a drug taken as a tablet or suspension and it absorbs compounds (so called Endotoxins) causing diarrhoea. (Cf. bone char, charcoal.); As a food additive, PVP is a stabilizer and has E number E1201. PVPP is E1202. It is also used in the wine industry as a fining agent for white wine. Other references state that as polyvinyl pyrrolidone and its derivatives are fully from mineral synthetic origin. Therefore, its use in the production should not be a problem for vegans. PVP is soluble in water and other polar solvents. In water it has the useful property of Newtonian viscosity. When dry it is a light flaky powder, which readily absorbs up to 40% of its weight in atmospheric water. In solution, it has excellent wetting properties and readily forms films. This makes it good as a coating or an additive to coatings. PVP was first synthesized by Prof. Walter Reppe and a patent was filed in 1939 for one of the most interesting derivatives of acetylene chemistry. PVP was initially used as a blood plasma substitute and later in a wide variety of applications in medicine, pharmacy, cosmetics and industrial production. Polyvinylpolypyrrolidone (PVPP, crospovidone) is a highly cross-linked modification of PVP. Polyvinylpyrrolidone (PVP) is a water-soluble polymer made from the monomer N-vinylpyrrolidone:.