226.  For staining glass—­No. 1 Flux

Minimum, or red lead, 3 parts; white sand, washed, 1 part.  This mixture is melted, by which it is converted into a greenish-yellow glass.

227.  No. 2 Flux

Of No. 1, 8 parts; fused borax, in powder, 1 part.  This mixture is melted.

228.  No. 3 Flux

Fused borax, 5 parts; calcined flint, 3 parts; pure minium, 1 part.  This mixture is also melted.  The above fluxes are used in procuring the different colours for staining glass.

229.  Indigo blue

Oxide of cobalt, 1 part; flux No. 3, 2 parts.

230.  Turquoise blue

Oxide of cobalt, 1 part; oxide of zinc, 3 or 4 parts; flux No. 3, 6 parts; melt and pour out.  If it is not sufficiently green, increase the zinc and flux.

231.  Azure blue

Oxide of cobalt, 1 part; oxide of zinc, 2 parts; flux No. 2, 8 parts; melt them together.

232.  Deep Azure blue

Oxide of cobalt, 1 part; oxide of zinc, 2 parts; flux No. 2, 5 parts.  The beauty of this colour depends on the proportion of flux.  As little as possible is to be used; it must, however, be brilliant.  Sometimes less is used than the proportion indicated.

233.  Sky blue

Oxide of cobalt, 1 part; oxide of zinc, 2 parts; flux No. 2, 12 parts; pound up, melt, and pour out.

234.  Emerald green

Oxide of copper, 1 part; antimonic acid, 10 parts; flux No. 1, 30 parts; pulverize together, and melt.

235.  BLUEISH green

Green oxide of chromium, 1 part; oxide of cobalt, 2 parts; triturate, and melt at a high heat.  The product is a button slightly melted, from which is removed the portion in contact with the crucible.  This button is pounded up, and three parts of flux No. 3, for one of the button, are added to it.

236.  Grass green

Green oxide of chromium 1 part, flux No. 3, 3 parts, triturate and melt.

237.  Deep yellow

Antimonic acid 2 parts, subsulphate of iron 1 part, flux No. 1, 10 parts; melt and pour out.  The subsulphate of iron may be increased a little, the proportions of flux vary.

238.  JONQUILLE yellow for flowers

Litharge 18 parts, sand 6 parts.  The product of the calcination of equal parts of lead and tin 2 parts, carbonate of soda 1 part, antimonic acid 1 part, rub together, or triturate, and melt.

239.  Wax yellow

Litharge 18 parts, sand 4 parts, oxide of antimony 2 parts, sienna earth 2 parts; melt.  If it is too deep the proportion of sienna earth may be decreased.

240.  Orange yellow

Chromate of lead 1 part, minium 3 parts.

241.  Brick red