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The brand new sugar/acid treatment solutions are done-by sopping opal for many days within the a warm service away from sugar-water, next submerging the newest opal in the sulfuric acidic. The new acid oxidizes the brand new glucose on the pore areas of your own opal, creating dark-colored carbon dioxide dirt and you can marks. Which imparts otherwise darkens a grey, black, otherwise brownish looks color on the opal. Continue reading