dyebath is prepared with the required quantity of dye, to which is added 10–20% Glauber’s salt and 2–5% acetic acid (both calculated on the weight of the skins). The skins are entered at 20° C., then after three-quarters of an hour to 40° C., and then after another hour slowly to 50–55° C. For blacks, the temperature is raised as high as 65° C. After dyeing the skins are treated with a solution containing per 10 liters 90–120 grams of olive-oil soap 12–25 grams olive oil 12 grams ammonia for 15 minutes, then hydro-extracted and dried, without further rinsing. For this method of dyeing, the following dyes may be used: For yellow and orange Fast Yellow S Acid Yellows Naphthol Yellow S Tropaeoline Orange GG, R, II, IV For reds Acid Reds Lanafuchsine Azo Orseille For violet Azo Wool Violet Acid Violets For blue Cyanole FF Azo Wool Blue Naphthol Blue R Formyl Blue B For green Naphthol Green B Fast Acid Green Cyanole Green For brown, combinations of Fast Yellow S Acid Yellows Tropaeoline DD Orange GG Lanafuchsine Indigo Blue N Cyanole B Fast Acid Green BN For black Naphthylamine Blacks Naphthol Blacks Naphthol Blue-black For grey Silver Grey N Dyed with the addition of 1/2–1% of alum The chrome colors are dyed on furs when very fast shades are desired, all the fancy colors being produced in this manner, but for black, only the acid dyes are suitable. The preparation of the skin is exactly the same as for the acid colors, except that the treatment with chloride of lime may be omitted, although for very full shades it is desirable. The dyeing is carried out as follows: The dyebath is prepared with the requisite amount of the desired dyestuff, which is previously dissolved, and to this is added a solution of sodium bichromate, the amount of this substance being half the weight of the dye. The solution is heated and the skins entered and dyed for 1–2 hours at 70–80° C. Then the dyebath is exhausted by the addition of 1/3% acetic acid, the skins being worked for another half hour, then rinsed, hydro-extracted and dried. Any of the one-bath chrome, or after-chrome colors may be used for this method.