| http://www.w3.org/ns/prov#value | - Inorganic materials having high specific surface such as certain forms of silica, talc, smectite clay minerals and synthetic aluminosilicates such as those identified as Zeolites A,B,P, X and Y are particularly suitable, but the most common inorganic salts such as sodium tripolyphosphate, sodium sulphate and magnesium sulphate can also be used provided they are in a stable hydrate form.
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