Colors For Polished Brass.
| Sulphate of copper | 120 grains |
| Hydrochlorate of ammonia | 30 grains |
| Water | 1 quart |
greenish shades are obtained. With the following solution all the shades of brown from orange brown to cinnamon are obtained: {128}
| Chlorate of potash | 150 grains |
| Sulphate of copper | 150 grains |
| Water | 1 quart |
The following solution gives the brass first a rosy tint and then colors it violet and blue:
| Sulphate of copper | 435 grains |
| Hyposulphite of soda | 300 grains |
| Cream of tartar | 150 grains |
| Water | 1 pint |
| Upon adding to the last solution |
| Ammoniacal sulphate of iron | 300 grains |
| Hyposulphite of soda | 300 grains |
there are obtained, according to the duration of the immersion, yellowish, orange, rosy, then bluish shades. Upon polarizing the ebullition the blue tint gives way to yellow, and finally to a pretty gray. Silver, under the same circumstances, becomes very beautifully colored. After a long ebullition in the following solution we obtain a yellow-brown shade, and then a remarkable fire red:
| Chlorate of potash | 75 grains |
| Carbonate of nickel | 30 grains |
| Salt of nickel | 75 grains |
| Water | 16 ounces |
The following solution gives a beautiful, dark-brown color:
| Chlorate of potash | 75 grains |
| Salt of nickel | 150 grains |
| Water | 10 ounces |