Page:Theophrastus - History of Stones - Hill (1774).djvu/358

 the Acid of Sulphur, Vitriol, or Alum; which are, indeed, the ame with the former, and with each other, in different Combinations, can do it: And even no better a Mentruum than common Water running over a Quantity of native Sal Armoniac, is able to produce from Copper, all the different Degrees of Blue, from that of the palet to that of deepet oriental Sapphires.


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