| http://www.w3.org/ns/prov#value | - The method of claim 1 wherein the heat absorbing additive is an antimicrobial agent selected from antimicrobial metals, antimicrobial metal salts, ion-exchange type antimicrobial agents having ion-exchange antimicrobial metal ions and soluble glass particles having incorporated therein antimicrobial active agent in the form of an antimicrobial metal, metal salt, or metal ion.
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