Young's Demonstrative Translation of Scientific Secrets Part 12

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 b.u.t.ton slightly melted, from which is removed the portion in contact with the crucible. This b.u.t.ton is pounded up, and three parts of flux No. 3, for one of the b.u.t.ton, are added to it.

236. GRa.s.s 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

Yellow No. 240, 12 parts; red oxide of iron, 1 part.

242. DEEP BLOOD RED

Subsulphate of iron, calcined in a m.u.f.fle until it becomes a beautiful capucine red, 1 part; flux No. 2, 3 parts; mix without melting.

243. BROWN YELLOW OCHRE

Yellow ochre No. 244, 10 parts; sienna earth, 1 part; triturate without melting.

244. DEEP YELLOW OCHRE--CALLED YELLOW BROWN

Subsulphate of iron, 1 part; oxide of zinc, 1 part; flux No. 2, 5 parts; triturate without melting.

245. PURE PURPLE

The purple powder of Ca.s.sius mixed while moist with flux No. 3, and sometimes a little chloride of silver previously melted with flux No. 3. If the purple, when prepared, does not melt sufficiently easy, some flux may be added when it is dry.

246. DEEP VIOLET

The purple of Ca.s.sius, in place of flux No. 3, flux No. 1 is mixed with it. Sometimes a little of blue No. 233 is added.

247. FLESH RED

The sulphate of iron, put in a small crucible, and lightly calcined, produces a suitable red oxide. Those which have the desired tone are selected. All the flesh reds are made in this way, and vary only in the degree of heat which they receive.

248. HAIR BROWN

Yellow ochre, No. 244, 15 parts; oxide of cobalt, 1 part; well triturated and calcined, in order to give the tone to it.

249. LIVER BROWN

Oxide of iron made of a red brown, and mixed with three times its weight of flux No. 2. A tenth of sienna earth is added to it if it is not sufficiently deep.

250. WHITE

The white enamel of commerce in cakes.

251. YELLOWISH GREY

Yellow No. 252, 1 part; blue No. 233, 1 part; oxide of zinc, 2 or 3 parts; flux No. 2, 5 parts; sometimes a little black is added, according to the tone which the mixture produces. The proportions of the blue and yellow vary.

252. YELLOW FOR BROWNS & GREENS