Artificial Gems. Part 2

Description

This section is from the "Encyclopedia Of Practical Receipts And Processes" book, by William B. Dick. Also available from Amazon: Dick's encyclopedia of practical receipts and processes.

Artificial Gems. Part 2

2422. Patent Base for Artificial Gems

2422. Patent Base for Artificial Gems. The base of these gems, as patented by the Superintendent of the Royal Porcelain "Works at Berlin, is a flux obtained by melting together 6 drachms carbonate of soda, 2 drachms burnt borax, 1 drachm saltpetre, 3 drachms minium, and 11/2 ounces purest white sand.

2423. Loysel's Strass or Paste

2423. Loysel's Strass or Paste. Pure silex (flint or quartz), 100 parts; red oxide of lead (minium), 150 parts; calcined potash, 30 to 35 parts; calcined borax, 10 parts; arseni-ous acid, 1 part. This produces a paste which has great brilliancy and refractive and dispersive powers, and also a similar specific gravity to the oriental diamond. It fuses at a moderate heat, and acquires the greatest brilliancy when re-melted, and kept for 2 or 3 days in a fused state, in order to expel the superabundant alkali, and perfect the refining.

2424. Fontanier's Base for Artificial Gems

2424. Fontanier's Base for Artificial Gems. Mix together 8 ounces pure silica and 24 ounces salt of tartar; bake, cool, wash with dilute nitric acid, and afterwards with water; dry, powder, add 12 ounces pure carbonate of lead, and to every 12 ounces of the mixture add borax, 1 ounce; triturate in a porcelain mortar, melt in a clean crucible, and pour the fused compound into cold water; dry, powder, and repeat the process a second and a third time in a clean crucible, observing to separate any revived lead. To the third frit add nitre, 5 drachms, and again melt. The product is perfectly limpid and extremely brilliant.

2425. Doualt-Wi'eland's Paste or Strass

2425. Doualt-Wi'eland's Paste or Strass. Rock crystal, 4056 grains; minium, 6300 grains; potash, 2154 grains; borax, 276 grains; arsenic, 12 grains. Or: Sand, 3600 grains; pure carbonate of lead, 8508 grains; potash, 1260 grains; borax, 360 grains; arsenic, 12 grains.

2426. Lancon's Paste or Strass

2426. Lancon's Paste or Strass. Litharge, 100 grains; silex, 75 grains; white tartar or potash, 10 grains.

2427. Red Cornelian

2427. Red Cornelian. Strass, 2 pounds; glass of antimony, 1 pound; calcined peroxide of iron (rouge), 2 ounces; manganese, 1 drachm.

2428. White Cornelian

2428. White Cornelian. Strass, 2 pounds; washed yellow ochre, 2 drachms; calcined bones, 1 ounce.

2429. Oriental Garnet or Carbuncle

2429. Oriental Garnet or Carbuncle. Fuse 512 grains paste, 256 grains glass of antimony, 2 grains purple of cassius, and 2 grains oxide of manganese. Or: 359 grains paste, 178 grains glass of antimony, and 2 grains oxide of manganese.