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THE Colour of Sea-Green is given by the Ita∣lians to Beryl, which is a Precious Stone found at the Foot of Mount Taurus, by the River Euphra∣tes, which has the Green-blue of the Sea. It is found in the Indies of a Colour somewhat paler,
which makes it be called by different Names, and when the Colour is deeper, they commonly pass for other Precious Stones: It is therefore the Water expresses its Colour. We will treat more largely of it in our fifth Book, wherein we shall shew the way of imitating Precious Stones.
This Colour, which is one of the finest Sky-Colours, ought to be made in fine and well purifi'd Crystal, which the Italians call Bollito, for if you make it in common Glass it is not so fair: You must likewise put no Manganese in this Colour. To make it therefore very fine and beautiful, Take Crystal-Fritt, put it in a Pot in the Furnace, where being well melted and clear, you must skim off the Salt, which will swim on the top like Oil, with an iron Ladle: for if you should not take it off, the Colour would be foul and oily. The Matter being well purified, you must add to it, to every 20 pounds or thereabouts, 6 Ounces of the Powder of Copper calcin'd, as we have taught in Chapt•••• XXX. with a fourth part of Zaffer prepar'd, also in Powder, and well mixed both together; in p••••∣ting both these Powders into the Pot on the Cr••∣stalline Metal, you must do it little by little, for fear the Crystal rising and swelling should run over, whereof care must be taken, stirring it well all the while. This being done, let the Metal stand still and settle for the space of three hours, that the Colour may incorporate, then stir it again: then the Workman may make a proof of the Colour. Twenty four hours after the mixing of the Powders it may be wrought, for by that time it will be well coloured; but the Workman must first well mix the whole, for fear the Colour should not be preci∣pitated to the Bottom. Which must always be well observed in all Vessels wherein there are Colours, and the Doses of the Tinctures rightly proportion∣ed
to the Crystalline Metal in the Pots, according to the quantities we have set done.