Jim
Posts: 2394
Joined: 7/5/2005 From: Lewistown, PA Status: offline
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Square inks like that were used by many different ink companies. Yours appears to have turned a nice, natural sun-colored amethyst. That would date it in the early 1900s. Prior to World War 1, glassmakers used manganese in the glass batch to make natural aqua glass turn clear. Over the years, exposure to light will turn manganese glass clear bottles amethyst. Beware of DARK purple bottles of that era, though. Some people use strong ultraviolet light to alter such bottles, giving a dark, funky and unnatural purple color. ~Jim
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