Take crystalline white pebble stones that are very white throughout and have no mixture of any other color which you shall find in fountains and on the sands of the sea. Put them into a crucible and make them glowing hot (covering the crucible). Then cast them into cold water, by which means they will crack and be easily reduced into a powder. Take the powder thereof and put the like quantity of pure salt of tartar thereto, which salt must not be made in any metalling, but glass vessels, so that it may have no mixture of any other colon To this mixture you may add what color you please which must be of a mineral or a metalline nature. Then put them into a very strong crucible which must be but half full and then covered, and there melt them in a strong fire until they become like glass. Note that when this mixture is in melting you must put an iron rod into it and take up some of it, and if there appears no corns of gravel in it, it is enough. If otherwise, you must melt it longer. The especial minerals and metals that give colons are these, viz., copper, iron, silver, gold, wismut, magnesia, and granite.
Common copper makes a sea green; copper made out of iron, a grass green; granite, a smaragdine green; iron, yellow or a hyacinth color; silver, white yellow, green, and granite color; gold, a fine sky color; wismut common blue; magnesia, an amethyst colon And if you will mix two or three of these together, they will give other colors. For copper and silver mixed together give an amethyst color; copper and iron, a pale green; wismut and magnesia, a purple color; silver and magnesia, diverse colors like as an opal. If you would have this mass not to be transparent, but opaque, you may add the calx of tin to it when it is in melting. As if you would make lapis lazuli, then to your mixture colored with wismut add the calx of tin, and this mixture when it is almost ready to congeal cast into a mold where some powder of gold has been scattered and, by this means, it will become full of golden veins very like true lapis lazuli which is very pleasant to behold. You may by these foresaid preparations cast what forms or figures you please, of what color you please. The metals and minerals for the making of colors ought to be thus prepared as follows. Plates of copper must be made red hot and then quenched in cold water, of which then take five or six grains, and mix them with an ounce of the aforesaid mixture, and melt them all together and they will color it sea green.
Iron must be made into a crocus in a reverberatory fire, and then eight or ten grains thereof will tinge the mixture into a yellow or hyacinth colon
Silver is to be dissolved in aqua fortis and precipitated with oil of flints, then dulcified with water, and afterward dried. Of this five or six grains give a mingled colon
Gold must be dissolved in aqua regis, precipitated with the liquor of flints, and then sweetened and dried. Five or six grains thereof give the finest sapphire color to an ounce of the mixture. If gold be melted with regulus martis nitrosus, five or six grains thereof give to an ounce of this mass a most incomparable rubine colon
Magnesia may be powdered only, and then ten or twelve grains thereof make an amethyst color. Wismut must be dissolved in aqua regis and precipitated with liquor of flints, and then sweetened and dried. Of this four or five grains turn an ounce of the mass into a sapphire color, but not so natural as gold does.
Granite may be powder only, and then ten or fifteen grains thereof tinge an ounce of the mass into a fine green color not unlike to the natural smaragdine.
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