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THIS Method of making Vltra-marine, is much more ready than the former; and Experience will shew whether the Colour be a gainer or loser thereby.
Take a Pound of Lapis Lazuli, calcine it in a Crucible, and quench it afterwards in Vinegar, so let it dry, and then reduce it to a very fine Pow∣der; grind it on a Porphyry, with fair Water, and
so set it in a glazed Earthen Vessel in the Shade, un∣til it be dry; if you find it coagulated all in a Mass, you must Powder it again.
This done, make a Cement of three Ounces of Grecian-Pitch, four Ounces of Rosin of the Pine, three Ounces of Mastick, three Ounces of Fran∣kincense, two Ounces of Oyl-Olive; set these over a slow Fire in a small Earthen Pot, into which pour first the Oyl, and when that's hot, put in the Rosin, then the Pitch, then the Incense, and last of all the Mastick, stirring them continually with the Wooden Spatula, and let them boil a little.
Having made the Cement, get another Earthen Vessel, and put thereinto the Lapis Lazuli, and pour on it the Cement hot, stirring the whole together with the Spatula very leisurely, until they perfectly incorporate; let this stand a whole Day, and when you would draw off the Colours, pour thereon boil∣ing Water, stirring it very smartly.
When it begins to cool, pour it out, and so put in more hot Water; do thus till the Water begins to draw off the Colour, and so continue until it be quite extracted; you may distinguish the Waters, and so set them apart, and obtain the Variety of Colour, as in the former way.
If your Colour seems to be clammy, or nasty, you may correct it thus. Add thereto Tartar dissolved in Water, as much as will drown it, and let it re∣pose for one Day at least, so wash it in warm Wa∣ter, and you will by that means have it very correct, and well purified.