2712. Emerald Green

2712.    Emerald Green. Mix 10 parts pure verdigris with sufficient boiling water to form a soft pulp, and strain this through a sieve. Dissolve 9 or 10 parts white arsenic in 100 parts boiling water, and, whilst boiling, let the verdigris pulp be gradually added, constantly stirring the mixture till the precipitate becomes a heavy granular powder. It is, on the whole, a permanent color. It should not be used with cadmium yellow, as that is a sulphide, and with it forms sulphide of copper, which is brown. It is a good oil pigment when properly used; it has but little body. It answers well in water-color painting; it cannot, however, be used in fresco or silicious painting.

2713. Green without Arsenic

2713.    Green without Arsenic. Dissolve 48 pounds sulphate of copper and 2 pounds bichromate of potash in water, and add to the clear solution 2 pounds pearlash and 1 pound chalk.

2714. Rinmann's Green Pigment

2714. Rinmann's Green Pigment. Dissolve together in sufficient water 1 part sulphate of cobalt and 3 sulphate of zinc; precipitate with carbonate of soda, wash the precipitate, and calcine it. It is a permanent color.

2715. Chrome Green

2715.    Chrome Green. A mixture of chrome yellow and Prussian blue. (See No. 2707 (Orange Chrome).)

2716. Black for Miniature Painters

2716.    Black for Miniature Painters. Take camphor, and set it on fire, and collect the soot by means of a saucer or paper funnel inverted over it. This black, mixed with gum-arabic, is far superior to most India-ink.

2717. To Make Lampblack

2717.     To Make Lampblack. This can bo prepared on a small scale in the following manner: Suspend over a lamp a conical funnel of tin plate, having above it a pipe to convey from the apartment the smoke which escapes from the lamp. Large mush-room - like concretions of a very black carbonaceous matter, and exceedingly light, will be formed at the summit of the cone, and must be collected from time to time. This black may be rendered less oily and drier by calcination in close vessels. The funnel should be united to the pipe, which conveys off the smoke, by means of wire, because solder would be melted by the flame of the lamp.

2718. Indian Red, or Crocus

2718.    Indian Red, or Crocus. This is made from jeweler's rouge, by subjecting the scarlet calcined sesquioxide of iron to a further calcination at a very intense heat. It is then known as purple brown.

2719. Ivory-Black

2719.      Ivory-Black. Burn shavings and waste pieces of ivory in a covered crucible, till no more smoke issues. Cover it closely while cooling. It should be afterwards washed with diluted muriatic acid, then with water till no longer acid, dried, and again heated in a covered crucible. It is of a deeper color than bone-black, and is used as a pigment, a tooth powder, and to decolorize syrups and other liquids.