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NOTWITHSTANDING we have in the pre∣ceding Chapter shewn how to imitate very nearly the Vltra-marine Blue, with ordinary Ena∣mel, whereof we have given the Preparation in Chap. 190. yet we will shew too the Way to make German-Blue by Art, which is a Colour very fine and convenient to Paint withal.
Take four Ounces of Mercury, or Quick-silver, si•• Ounces of Flower of Sulphur, and a Pound of Sal-Armoniack;
pound these very well in a Stone-Mor∣tar, till all the Mercury be quite suppress'd, and no longer precipitable, then put the Mass into a Glass Body, the bottom luted up to the middle; set this on a very slow Ash-Fire, let it stand uncovered until all the moisture be exhaled, then head it very close, and so improve the heat by degrees, until you bring the Mass to a Sublimation; and thus you'll have a very fine and delicate Azure, or German-Blue, which reduce to very soft Powder on a Marble, or Porphi∣ry, keeping it afterwards for uses in Painting.