Dictionarium Polygraphicum. Beryl.

Dictionarium Polygraphicum:
Or, The Whole Body of Arts Regularly Digested.
Vol I.
London: Printed for C. Hitch and C. Davis in Pater-noster Row, and S. Austen in St. Paul's Church Yard. MDCCXXXV.
I. To make a Beryl colour or green blue, viz. a sea green for glass.

Take crystal frit without manganese what quantity you please, melt it very thin and skim off the salt (which will swim on the top like oil) with an iron ladle, or else the colour will be foul and oily: the matter being purified to twenty pound of it, put of calcin’d copper [see CALCINATION of COPPER] six ounces, zaffer prepar'd an ounce and a half, mix them well together: put this mixture into the pot of metal by little and little, for fear the crystal should rise or swell and run over; keep it stirring all the while, and then let the metal stand and settle for three hours, that the colour may incorporate, and then stir it again.

Make proof of it, and after the powders have been mixt ser twenty four hours, and having been stirred and mixed well, it may be wrought; because the colour is very apt to fall to the bottom.

To make a poste for a BERYL, or sky colour call'd aqua marina.

Take rock crystal prepar'd (see rock CRYSTAL) ten ounces, minium or red lead twenty five ounces, zaster prepar’d five drams five grains, reduce them all to a very fine powder, mix them and put them into a crucible able to resist the fire, leaving an inch or more empty, cover it with an earthen cover, lute it well and dry it; put it into the hottest place of a potter's furnace, and let it stand as long as their pots; when cold break the crucible and you will find a fine sky colour. Or

Take rock crystal prepar'd ten ounces, æs ustum one ounce, and fifteen grains, mix them, and in a crucible perform the work as the former.

II. Another Beryl or Aigue Marine.
Take ten ounces of powder of rock crystal, fine salt of tartar (see SALT of TARTAR) ten ounces, salt of vitriol nine ounces; being all finely powdered searced and mixed in a brass mortar proceed as in the first example.

III. Another deeper Beryl or Aigue Marine.
Take ten ounces of rock crystal, of fine verdegrease three drams and one scruple, of fine salt of tartar thirteen ounces and a half, reduce all to a fine powder, mix them in a mortar, and proceed as before.

Another way.
This Beryl colour is of a very fine sky colour, if you take one ounce of powder of crystal, one ounce of fine salt of tartar, and fix ounces of salt of vitriol; the whole reduc’d to a fine powder in a brass mortar, and searced through a fine fieve, and proceed as in the others.

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