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Sep 28, 2017 at 4:17 comment added rebusB The food safety factor with blown glass depends on the batch used: furnaces are usually fed from a mix of raw materials, not just cold glass, and the some mixes have arsenic. The colored glass that gets added can contain toxins too which is why a clear coat is recommended above.
Sep 28, 2017 at 0:04 history answered magerber CC BY-SA 3.0