Dictionarium polygraphicum. BLUE for painting or staining glas.

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.
1735
Take of fine white sand twelve ounces, zaffer and minium of each three ounces; reduce them to a fine powder in a bell-metal mortar; then put this powder into a very strong crucible, cover it and lute it well, and being dry, calcine over a quick fire for an hour; then take out the matter, and pound it well in the mortar as before; then to sixteen ounces of this powder add fourteen ounces of nitre powdered, mix them well together, and put them into the crucible again, cover and lute it, and calcine for two hours in a very strong fire.

Take it out and grind it as before, then add to it a sixth part of nitre, and calcine again as before for three hours more; then take out the matter with an iron spatula red hot, left it should stick; it being very clammy, and not easily emptied.