Aniline Black.
| Aniline hydrochloride | 40 parts |
| Potassic chlorate | 20 parts |
| Copper sulphate | 40 parts |
| Chloride of ammonia (sal ammoniac) | 16 parts |
| Warm water at 60° F | 500 parts |
After warming a few minutes the mass froths up. The vapor should not be inhaled. Then set aside, and if the mass is not totally black in a few hours, again heat to 60° F., and expose to the air for a few days, and finally wash away all the soluble salts and the black is fit for use.
Aniline Black Substitutes.
| Aniline (fluid measure) | 30 parts |
| Toluidine (by weight) | 10 parts |
| Pure hydrochloric acid, B. P. (fluid measure) | 60 parts |
| Soluble gum arabic (fluid measure) | 60 parts |
Dissolve the toluidine in the aniline and add the acid, and finally the mucilage.
II.—Mix together at gentle heat:
| Starch paste | 13 quarts |
| Potassic chlorate | 350 scruples |
| Sulphate of copper | 300 scruples |
| Sal ammoniac | 300 scruples |
| Aniline hydrochloride | 800 scruples |
Add 5 per cent of alizarine oil, and then steep it for 2 hours in the dye bath of red liquor of 2 1/2° Tw. Dye in a bath made up of 1/2 ounce of rose bengal and 1 1/2 ounces of red liquor to every 70 ounces of cotton fabric dyed, first entering the fabric at 112° F., and raising it to 140° F., working for 1 hour, or until the desirable shade is obtained; then rinse and dry.