| http://www.w3.org/ns/prov#value | - The more useful aqueous silica sols (that is, the sols employed prior to the addition of the acidic or basic substance) for use in the processes of this invention are those which, in addition to having the characteristics referred to above, contain less than 1.5% by weight of inorganic salts, for example, MC1 or M2804 (where M is an alkali metal) or -other salts, preferably less than 1% by weight
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