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Updated: May 17, 2025
There is an Experiment, Pyrophilus, which though I do not so exactly remember, and though it be somewhat Nice to make, yet I am willing to Acquaint You with, because the thing Produc'd, though it be but a Curiosity, is wont not a little to please the Beholders, and it is a way of turning by the help of a Dry Substance, an almost Golden-Colour'd Concrete, into a White one, the Several Tryals are not at present so fresh in my Memory to enable me to tell you Certainly, whether an Equal onely or a Double weight of Common Sublimate must be taken in reference to the Tinglass, but if I mistake not, there was in the Experiment that succeeded best, Two parts of the Former taken to One of the Latter.
The like Calx will be afforded as I have try'd by a Solution of that shining Mineral Tinglass dissolv'd in Aqua Fortis, and Præcipitated out of it; and divers of these Calces may be made at least as Fair and White, if not better Colour'd, if instead of Oyl of Tartar they were Præcipitated with Oyl of Vitriol, or with another Liquor I could Name.
I will not undertake that though you'l hardly miss changing the Colour of your shining Tinglass, yet you will the first or perhaps the second time hit Right upon the way of making the Glistring Sublimate I have been mentioning.
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