The art of glass shewing how to make all sorts of glass, crystal and enamel : likewise the making of pearls, precious stones, china and looking-glasses : to which is added, the method of painting on glass and enameling : also how to extract the colours from minerals, metals, herbs and flowers ... : illustrated with proper sculptures / written originally in French, by Mr. H. Blancourt, and now first translated into English ; with an appendix, containing exact instructions for making glass-eyes of all colours.

CHAP. CCVII. To make Red Colour for Glass Paint.

THIS requires as much caution as the Blue: You must take Scales of Iron, and Litharge of Silver, of each a Dram, Feretto of Spain half a Dram, Rocaille three Drams and half; grind all these for half an Hour on a shallow Copper-Plate, in the mean time pound three Drams of Blood-Stone in an Iron-Mor∣tar, and add it to the rest; then pound a Dram of Gum-Arabick in that Mortar to an impalpable Pow∣der, to take off the remains of your Blood-stone, and so add it to the rest, grinding them still continually, lest the Blood-stone be spoiled.

The best manner of grinding these is to pour Wa∣ter by little and little on the Ingredients as you grind them, neither wetting them too much, nor too lit∣tle, but just as much as will keep a good Temper as for Painting: Afterwards put all into a foot Glass, and so drop on it through a small hollow Cane of Wood, or with your Finger, as much Water as will bring it to the consistence of an Eggs-Yolk buttered, or a little more, then cover the Glass to preserve it from Dust, and so let it stand three Days to settle. After this, decant the clearest and purest of the Co∣lours that rise at top, into another Glass, without

disturbing the Sediment; and two Days after it has settled anew, pour off again the purest of the Colours as before. This done, set it in the Body of a broken Matrass, or Bolt-head, over a gentle flow Fire, to dry easily, and so keep it for use.

When you have occasion for it, take a little fair Water in a Glass, and with it moisten as much Co∣lour as you think convenient, that will be excellent for Carnation; as for the Faeces, which are very thick, dry 'em too, and you may moisten these in like man∣ner with Water for Drapery, Timber-colour, and such other as you think convenient.