| http://www.w3.org/ns/prov#value | - Hydratable chemicals useful in the practice of this invention include alkali metal hydroxides, such as sodium hydroxide and potassium hydroxide; silicates, such as sodium metasilicate; phosphates, particularly phosphates of the formula M--PO3 M)n OM or the corresponding cyclic compounds ##STR1## wherein M is an alkali metal and n is a number ranging from 1 to about 60, typically less than 10 for c
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