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are cellulose ethers , derivatives of cellulose , in which a part of hydroxy groups as ethers with a carboxymethyl group (-CH 2 associated -COOH). The cellulose is obtained from softwood and hardwood.
C 1636 (OTTO) Carboxymethylcellulose sodium salt, low viscosity Cas 9004-32-4 - used in paper applications such as restoration of archival documents.