| Tincture capsicum | 2 ounces |
| Tincture opium | 2 ounces |
| Tincture camphor | 3 ounces |
| Tincture catechu | 4 ounces |
| Tincture rhubarb | 4 ounces |
| Spirit peppermint | 4 ounces |
Blackberry Mixture.—
| Fluid extract blackberry root | 2 pints |
| Fluid ginger, soluble | 5 1/3 ounces |
| Fluid catechu | 5 1/3 ounces |
| Fluid opium for tincture | 160 minims |
| Brandy | 8 ounces |
| Sugar | 4 pounds |
| Essence cloves | 256 minims |
| Essence cinnamon | 256 minims |
| Chloroform | 128 minims |
| Alcohol (25 per cent), q. s. ad. | 1 gallon |
CHOWCHOW: See Condiments.
CHROME YELLOW, TEST FOR: See Pigments.
CHROMIUM GLUE: See Adhesives.
CHROMO MAKING.
The production of chromo pictures requires a little skill. Practice is necessary. The glass plate to be used should be washed off with warm water, and then laid in a 10 per cent solution of nitric acid. After one hour, wash with clean, cold water, dry with a towel, and polish the plate with good alcohol on the inside—hollow side—until no finger marks or streaks are visible. This is best ascertained by breathing on the glass; the breath should show an even blue surface on the glass.
Coat the unmounted photograph to be colored with benzine by means of wadding, but without pressure, so that the retouching of the picture is not disturbed. Place 2 tablets of ordinary kitchen gelatin in 8 3/4 ounces of distilled or pure rain water, soak for an hour, and then heat until the gelatin has completely dissolved. Pour this warm solution over the polished side of the glass, so that the liquid is evenly distributed. The best way is to pour the solution on the upper right-hand corner, allowing it to flow into the left-hand corner, from there to the left below and right below, finally letting the superfluous liquid run off. Take the photograph, which has been previously slightly moistened on the back, lay it with the picture side on the gelatin-covered plate, centering it nicely, and squeeze out the excess gelatin solution gently, preferably by means of a rubber squeegee. Care must be taken, however, not to displace the picture in this manipulation, as it is easily spoiled.
The solution must never be allowed to boil, since this would render the gelatin brittle and would result in the picture, after having been finished, cracking off from the glass in a short time. When the picture has been attached to the glass plate without blisters (which is best observed from the back), the edge of the glass is cleansed of gelatin, preferably by means of a small sponge and lukewarm water, and the plate is allowed to dry over night.