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WE will pass from Blue to Green, and from Venus to Mars, which enters into the pre∣paration of this. For making this Emerald Colour, take common Glass well purified from its Salt, without Manganese, as we have shewn in Chap. 12. Put it in a Pot in the Furnace, and when it is well
melted and purified, add to it (for Example) to 100 Pounds of Glass, 3 ounces of Crocus Martis Calcined with Vinegar as in Chap. 25. mix well the Glass at the same time to make it Incorporate with the Crocus, then let it rest an hour, that it may throughly take the Colour. This way nothing will come out Yellowish, and it will lose that Foulness and Blueness which the common Metal always hath, and it will become Green. Then add to the same dose of 100 Pounds of Glass 2 Pound of the Scales of Copper thrice calcin'd as in Chap. 34. And put it in at Six divers times, Mixing it well each time with the Glass, then let it stand 2 hours to imbibe the Tincture. After 2 hours stir it again, and see if it be as you would have it; if the Colour be too Blue you must add to it some Crocus Martis prepared as before and you will have a very fine Emerald Colour. Twenty four hours after, mix it as before; and then you may work it as you Please.