Abbreviation for the polysaccharide carboxymethyl cellulose (also cellulose gum). The substance is used in detergents as a dirt carrier, in pharmacy as a coating agent, and in the food industry as a thickener and water retention system. CMC has been in viticulture since August 1, 2009 as part of the new EU wine market regulations Means in winemaking approved for all types of wine. It is used for crystal stabilization. CMC is deposited on the surface of dissolved Weinstein and thereby prevents crystal growth. The first attempts were made in the early 1980s. By a recommendation of OIV legal recognition has been initiated. The agent is obtained from plant fibers. The amount is limited to a maximum of 10 g / hl, the application can take place as powder, granulate or viscous liquid. The latter is best soluble in wine. CMC works similarly metatartaric, but has the advantage over this that it is insensitive to temperature and also effective in warm conditions.