ring, with the sand, and the image in the sand may be very hot: then take off the ring, to see if the image have suffered any loss; which, if it have not, you must put upon it so much of the aforesaid glass, coursly beaten, as sufficeth in the fusion to fill the image impressed on the sand; which done, put the ring again under the tile, and administer a fire of fusion, till the glass melt in the ring; to which, touch with a smooth iron and light, (with a handle) being hot the ring being taken first out of the furnace with tongs, pressing the glass well to the mold; and then place it under a hot iron, or earthen vessel to cool; and being cold, take the image from the mold, which answers to it in all things, if thou hast aright proceeded, exactly representing the Carvers art, or a seal impressed on a jewel, which excellent work is most fit to feign, and represent Antiquities and Rarities. _The colouring of the aforesaid mass follows, by which it is made most like to Gems._ It behooveth that colours be taken from metals and minerals, namely from Copper, Iron, Gold, Silver, Wismuth, Magnesia and Granate; of other colours I know nothing of certainty, Copper commonly makes a colour green like the Sea, Copper with Iron, grass-green; Granate a smaragdine colour, Iron yellow or jacynth; Gold the best skie colour; Wismuth common skie colour; Magnesia Amethystine, mixt, they give other colours; E. gr. Gold mixt with Silver gives an Amethyst colour; Iron and Copper, a pale green; Wismuth and Magnesia, a purple; Silver and Magnesia, various colours like an Opal. Images are also made of divers colours, if the masses of diverse colours be broken into bits and mixt, be put upon the Mold, _&c._ And if thou desirest an opac mass (green, red, skie colour, _&c._) add a little calx of Tin darkning, on which as on a Basis the colours insist. For example; in making a Turcoise stone or a Lazulus, mingle with the Azure made of the silver Marcasit or Zafora (to colour the mass) the calx of Tin, that they may melt together, and before the impression be made, put upon the Mold some prepared gold, then spread and put upon this the aforesaid glass; and the fusion and impression being made, will be made thence a stone having golden veins like _lapis Lazulus_ very delightful; But there must be a _calx_ of Gold not losing its splendor in the fire, such as is made by Mercury, or that which is better, which is precipitated out of _Aqua Regia_: of which above. _Of the preparation of the colours for colouring the mass of Flints and Crystals._