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IF a Mixture of Gold and Silver be cast into Aq. Fortis, the Gold falling to the Bottom will be turn'd black, tho' neither the Silver or Aq. Fortis were of that Colour. It is look'd upon by Alchymists, that a Mineral abounds with Gold, if it precipitates a black Powder: And it hath been observ'd, that Gold and Sil∣ver refin'd would fully white Cloth, by rub∣bing them on it: And I have likewise taken no∣tice, that Pens would be colour'd black, by a Silver case I kept them in.