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Updated: June 5, 2025
Another way of sophisticating is with Oyl of Turpentine mixed in great quantity with that which is adulterated; You may easily discover the Oyl of Turpentine, by setting it on fire, for it yields abundance of ill-scented smoak, with very little savour of the Herb, Flour, or Seed, &c. and soon takes fire.
And in some Chymical Oyls, as particularly that of Lemmon Pills, by barely Shaking the Glass, that holds it, into Bubbles, that Transposition of the Parts which is consequent to the Shaking, will shew you on the Surfaces of the Bubbles exceeding Orient and Lively Colours, which when the Bubbles relapse into the rest of the Oyl, do immediately Vanish.
And as for the Experiment with Red-rose Leaves, the same thing may be alleged, for we found that such Leaves by bare Infusion for a Night and Day in fair Water, did afford us a Tincture bordering at least upon Redness, and that Colour being conspicuous in the Leaves themselves, would not by some seem so much to be produc'd as to be extracted by the affusion of Oyl of Vitriol.
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