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THE Beauty of Sapphire is no less imitable in Glass of Lead, than the Colours of other Precious Stones; and its clear Blue Transparent Colour will have as much Splendour. To make it, mix together fifteen Pound of Crystal Frit in Powder, and
twelve Pound of Calx of Lead, then searce it, pounding again what does not pass through the Sieve. Add to that two Ounces of prepared Zaffer, twenty four Grains of Manganese of Piedmont also well prepared, mix the whole well together, put it in a Pot heated in the Furnace, and let it stand to melt during the space of twelve Hours. Then cast the vitrified Matter into Water, and carefully take away the Lead that remains in the Pot; then put the Matter again into the same Pot, and let it stand to be re-purified Twelve Hours. Then see if the Colour pleases you, and you may Work it. You'll have a Colour like the true Ori∣ental Sapphire.