2649. Amber

2649.    Amber. Digest 1 part dragon's blood, coarsely powdered, in 4 parts oil of vitriol; when completely dissolved, dilute with distilled or soft water to the desired shade, and filter. (See No. 2648 (Druggists' Show Colors).)

2650. Indigo Blue

2650.     Indigo Blue. Dissolve indigo in sulphuric acid, and dilute with pure water to the required shade of color; filter as directed in No. 2648.

2651. Blue

2651.    Blue. Dissolve 2 ounces sulphate of copper in 1/2 ounce oil of vitriol and 1 pint of pure water; filter as in No. 2648.

2652. Prussian Blue

2652.     Prussian Blue. Dissolve pure Prussian blue in slightly diluted oxalic or muriatic (hydrochloric) acid; add water to bring the color to the desired shade, and filter. (See No. 2648 (Druggists' Show Colors).)

2653. Pink

2653. Pink. To a solution of chloride or nitrate of cobalt in water, add sufficient sesquicarbonate of ammonia to dissolve the precipitate at first formed. Filter as in No. 2648. Or: Wash 1 ounce madder in cold water; digest it, with agitation, for 24 hours in 3 pints water containing 4 ounces sesquicarbonate of ammonia; then dilute with water to the desired shade, and filter as above.

2654. Purple

2654. Purple. To an infusion of logwood, add sufficient carbonate of ammonia or of potassa to make the color. Filter as directed in No. 2648. Or: To an infusion of cochineal, add sufficient sulphate of indigo, nearly neutralized with chalk. Filter as above.

2655. Red

2655.    Red. Dissolve carmine in aqua ammonia and dilute with water to the desired shade; filter as in No. 2648. Or: Dissolve madder lake in a solution of sesquicarbonate of ammonia, and dilute with water; filter as above.

2656. Violet

2656.    Violet. Dissolve nitrate of cobalt in a solution of sesquicarbonate of ammonia; add sufficient ammonio-sulphate of copper to produce the color. Filter as in No. 2648.

2657. Yellow

2657.    Yellow. Dissolve 1/2 pound sesqui-oxideof iron (rust of iron), in 1 quart muriatic (hydrochloric) acid; dilute with water, and filter. (See No. 2648 (Druggists' Show Colors).) Or: Dissolve chro-mate or bichromate of potash in distilled water ; or equal parts of either the above and of nitre (saltpetre) dissolved in water, and filtered as above.

2658. Crimson

2658.   Crimson. To 1 ounce alkanet root add 1 pint oil of turpentine. Filter as directed in No. 2648. This is used chiefly for lamps.

2659. Green

2659.    Green. Dissolve 2 ounces blue vitriol (sulphate of copper) in 1 pint water; add sufficient bichromate of potassa to turn the liquid green. Or: A solution of 2 ounces blue vitriol (sulphate of copper), and 4 ounces chloride of sodium, in 1 pint of water. Or: A solution of distilled verdigris, in acetic acid, and diluted with water. Or: Dissolve blue vitriol in water as above, and add nitric acid till it turns green. All these must be filtered as directed in No. 2648.