| http://www.w3.org/ns/prov#value | - The precursor of the hydrophilic inorganic amorphous material is a material which, upon the removal of the solvent and optional heat treatment, is converted to the above-described hydrophilic inorganic amorphous material (i), and a preferred example of the precursor is at least one member selected from the group consisting of alkali silicates, alkali borosilicates, alkali zirconates, and metal pho
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