Blue Verditer

It is generally stated to be made by adding chalk to a solution of nitrate of copper produced in the process of refining silver; but Mr. Phillips did not succeed in making it by this means, and found no lime in the best samples.

New Blue

Mix equal parts of common arsenite of copper (see Mineral Green, below), and neutral arsenite of potash, fuse by heat in a large crucible, then add to the fused salt 1/5th of its weight of nitre. Effervescence takes place, and the salt becomes blue. Cool, pulverise, and wash.

Chrome Yellow

To a solution of bichromate of potash add a solution of nitrate of lead as long as a precipitate forms. Wash the precipitate, and dry it with a gentle heat. An inferior kind is said to be made by 4 lbs. of pure white lead, 1 lb. of bichromate of potash, and 20 lbs. of water, and boiling till the water becomes colourless. Or 75 parts of precipitated sulphate of lead may be acted on by a hot solution of neutral chromate of potash 25 parts. A mixed product of chromate and sulphate of lead is thus obtained, which is said to cover as well as the pure chrome yellow, and is much cheaper. (Riot).

Chrome Red

Melt saltpetre in a crucible heated to dull redness, and add chrome yellow, by small portions, till no more red fumes arise. Allow the mixture to settle, then pour off the melted salt from the heavy sediment, and wash the latter with water, which should be quickly poured off, and dry the pigment. The liquefied salt poured off contains chromate of potash, and is reserved for making chrome yellow.

Orange Chrome is chrome yellow acted on by an alkali, which deprives it of part of the chromic acid.

King's Yellow

This is a yellow sulphide of arsenic, now almost superseded by chrome yellow, but occasionally used for killing flies.

Naples Yellow

Mix 12 parts of metallic antimony, 8 parts of red lead, and 4 of oxide of zinc, and calcine in a reverberatory furnace. The mixed oxides are rubbed together, fused, and the fused mass elutriated into a fine powder. - Dr. Ure. M. Guimel recommends 1 part of well-washed antimoniate of potash to be ground into a paste with 2 parts of red lead, and the powder exposed to a red heat for 4 or 5 hours, keeping the heat moderate.

Brighton Green

An inferior colour, made with 28 lbs. of whiting, or white lead, 7 lbs. sulphate of copper, 3 lbs. sugar of lead, and 1/4 oz. of bichromate of potash.

Brunswick Green

Pour a saturated solution of chloride of ammonium over copper filings in a close vessel placed in a warm situation; add more of the solution from time to time till three parts of the chloride have been used to two of copper. After standing for a few weeks the pigment is separated from the unoxidized copper by washing through a sieve. It is then to be well washed, and dried slowly in the shade. It is often reduced with white lead; some samples contain arsenic.

Green without Arsenic

Dissolve 48 lbs. of sulphate of copper, and 2 lbs. of bichromate of potash in water, and add to the clear solution, 2 lbs. of pearlash and 1 lb. of chalk.