Method of forming an opalescent article having a colored bulk and at least one surface strata of a different color than the bulk
作者： Perry P Pirooz
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摘要: A glass article composed of silica and a coloring ion selected from Co, Ni, Cu, Sn, Sb, Pb is subjected to specified heat cycle, at least portion which in reducing atmosphere, cause coloration the bulk form one strata surface has color different that bulk. By selectively removing multi-colored formed.
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