What Is Cranberry Glass and How Is It Made?
Color in glass is achieved by adding coloring agents, or metallic oxides, to the molten combination of silica (a refined sand), an alkaline flux (usually potash or soda), and lime, which makes the glass more durable. Cranberry glass is closely related to ruby or red glass as both use gold as the coloring agent. There are stories of red glass being accidentally discovered when a gold ring was dropped into a batch of molten glass. It’s a romantic notion, but we know today that this would have only resulted in a puddle of melted gold sinking to the bottom of the molten glass, leaving it unchanged! In order for the gold to be properly mixed into the liquid glass, gold is ground into a fine powder and dissolved in “Aqua Regia” (a mixture of nitric and hydrochloric acid), before it is added to the batch. The solution of gold dissolved in Aqua Regia is called gold chloride. The amount of gold chloride that is present in the glass determines whether the glass will be a deep ruby red in color,
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