| http://www.w3.org/ns/prov#value | - An organic acid containing solution obtained by adding 0.5 ml of lactic acid, serving as an organic acid having a hydroxyl group, and 1 ml of pyruvic acid, serving as an organic acid including carbon and a heteroatom, to 5 ml of a solution including silanol condensate particles (whose schematic structure is shown in FIG. 2) at a concentration of 10 wt % in terms of SiO2 is stirred for approximatel
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