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Milk bottles from the western United States sometimes exhibit embossed numbers on the upper surface of the finish. Physical and historical evidence indicate that these numbers constitute a unique date code, indicating the month and year of production. Examination of more than 1,200 milk bottles from this region (227 with the code) demonstrates that the code was used by five California glass factories...
From the late-19th century on, there was an increased production of colorless bottles for a wide variety of products. Producing colorless glass is not difficult if pure sand with a very low iron content is available. Iron in sand gives the glass a range of colors from light green to dark amber, depending on the amount of iron in the sand. To overcome this problem, some factories that used iron-bearing...