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Updated: May 25, 2025
The Experiment was this. Beguinus, Tyr. Chy. Lib. 2º. Cap. 13º. We took good common Vitriol, and having beaten it to Powder, and put it into a Crucible, we kept it melted in a gentle heat, till by the Evaporation of some parts, and the shuffling of the rest, it had quite lost its former Colour, what remain'd we took out, and found it to be a friable Calx, of a dirty Gray.
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