Enamels. 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.

Enamels. Part 2

2381. Blue Enamels

2381. Blue Enamels. Either of the white fluxes colored with oxide of cobalt.

II. Sand, red lead, and nitre, of each 10 parts; flint glass or ground flints, 20 parts; oxide of cobalt, 1 part, more or less, the quantity depending on the depth of color required.

2382. Brown Enamels

2382. Brown Enamels. I. Red lead and calcined iron, of each 1 part; antimony, litharge, and sand, of each 2 parts; mix and add it in any required proportion to a flux, according to the color desired. A little oxide of cobalt or zaffre is frequently added, and alters the shade of brown.

II. Manganese, 5 parts; red lead, 16 parts; flint powder, 8 parts; mix.

III. Manganese, 9 parts; red lead, 34 parts; flint powder, 16 parts.

2383. Green Enamels

2383. Green Enamels. I. Flux, 2 pounds; black oxide of copper, 1 ounce; red oxide of iron, 1/2 drachm; mix.

II. As above, but use the red oxide of copper. Less decisive.

III. Copper dust and litharge, of each 2 ounces; nitre, 1 ounce ; sand, 4 ounces ; flux, as much as required.

IV. Add oxide of chrome to a sufficient quantity of flux to produce the desired shade; when well managed the color is superb, and will stand a very great heat; but in careless hands, it frequently turns on the dead-leaf tinge.

V. Transparent flux, 5 ounces ; black oxide of copper, 2 scruples; oxide of chrome, 2 grains. Resembles the emerald.

VI. Mix blue and yellow enamel in the required proportions.

2384. Olive Enamels

2384. Olive Enamels. Good blue enamel, 2 parts; black and yellow enamels, of each l part; mix. (Sec Brown Enamels.)

2385. Orange Enamels

2385. Orange Enamels. I. Red lead, 12 parts; red sulphate of iron and oxide of antimony, of each 1 part; flint powder, 3 parts; calcine, powder, and melt with flux, 50 parts.

II. Red lead, 12 parts; oxide of antimony, 4 parts; flint powder, 3 parts; red sulphate of iron, 1 part; calcine, then add flux, 5 parts to every 2 parts of this mixture.

2386. Purple Enamels

2386. Purple Enamels. I. Flux colored with oxide of gold, purple precipitate of cassius (see Nos. 2720 (To Make Purple of Cassius) to 2723), or peroxide of manganese.

II. Sulphur, nitre, vitriol, antimony, and oxide of tin, of each 1 pound; red lead, 60 pounds; mix and fuse, cool and powder ; add rose copper, 19 ounces; zaffre, 1 ounce; crocus martis, 1 1/2 ounces; borax, 3 ounces; and 1 pound of a compound formed of gold, silver, and mercury; fuse, stirring the melted mass with a copper rod all the time, then place it in crucibles, and submit them to the action of a reverberatory furnace for 24 hours. This is said to be the purple enamel used in the mosaic pictures of St. Peter's at Rome.