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THIS Peridor ought to be harder and more fixed than the precedent, because there is no Minium in it, but it will not be so Vivacious. Take one Ounce of our Natural Crystal in Powder, a Dram of Salt of Vitriol, two Drams of Vitriol calcined ad
rubedinem, four Grains of Verdigrease, and of our fine Salt of Tartar, as much as equals the whole in weight, i. e. one Ounce, three Drams, and four Grains. All these Matters being reduc'd into fine Powder in a Brass Mortar, mix them well together, then put them into a Crucible covered with another, and well luted, twelve Hours after take your Cruci∣ble and break it to take out the Matter, which cut and polish at the Wheel, then let it be Wrought by a good Workman.
We will not speak here of other sorts of Gems, which may be imitated by this same way, adding the Doses of their Tinctures.