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The third and last Experiment I shall now mention to shew, how prone Bodies abounding in Sulphureous parts are to afford a Red Colour, is one, wherein by the Operation of a Saline Spirit upon a White or Whitish Body, which accor∣ding to the Chymists should be altogether Sulphureous, a Redness may be produc'd, not (as in the former Experiments) slow∣ly, but in the twinkling of an Eye. We took then of the Essential Oyl of Anni∣seeds,
which has this Peculiarity, that in Cold weather it loses its Fluidity and the greatest part of its Transparency, and looks like a White or Whitish Oyntment, and near at hand seems to consist of a Multi∣tude of little soft Scales: Of this Coagu∣lated Stuff we spread a little with a Knife upon a piece of White Paper, and letting fall on it, and mixing with it a drop or two of Oyl of Vitriol, immediately (as we fore-saw) there emerg'd together with some Heat and Smoak, a Blood-Red Co∣lour, which therefore was in a trice pro∣duc'd by two Bodies, whereof the one had but a Whitish Colour, and the other (if carefully rectify'd) had no Colour at all.