| http://www.w3.org/ns/prov#value | - When present, suitable viscosifying polymers include those which may be crosslinkable and preferably include polysaccharides, anionic as well as nonionic, such as guar gums and derivatives, cellulose, starch, and galactomannan gums as well as polyvinyl alcohols, polyacrylates, polypyrrolidones and polyacrylamides and mixtures thereof.
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