most clear and transparent Rocaille, and such as is least charged with Colour, yet still 'tis very far from being sufficient; 'tis true, it contains less Lead, how∣ever even that which still remains is likewise impure, and not at all purified.
We have directed such as work in Enamel, and we cannot avoid it also here to advise you instead of Rocaille, to make use of our Crystalline Matter made with Saturnus Glorificatus, Chap. 112. or such other∣like Ingredients, as we have prescribed, which are perfectly cleansed; however to please every Body, we will give a Preparation of this Rocaille, and how to compound it, which is very easily done: Thus,
To make the Yellow Grains, you must take a Pound of fine white Sand, three Pound of Minium, mix and pound them together very well in a Mortar, and put the whole into a strong Crucible covered and luted, dry the lute, and put it afterwards into the Glass-house, or Wind-Furnace, where the Fire is violent, to reduce this Matter into Glass, as that of Saturn, made in Chap. 82. having thus finished the Rocaille, make it up into Grains, or any other Shape you please.
The Way of making the Green, is quite contrary to that of the Yellow: Put three Pound of fine white Sand to every Pound of Minium, and it will be very compact. This Stu•••• will alter its Colour, and become a pale Red in melting; and these are the Compositions and way of making this Rocaille, which most Workmen use: Thus you see there can be no preparing it without Lead, which makes it so full of Impurity.