_Dark Slate_.--Give a medium indigo bottom, then mordant with 3 lb. fluoride of chrome and 1 lb. oxalic acid, and dye with 1-1/2 lb. Anthracene Brown W, 1/2 lb. Alizarine Bordeaux G, and 1 oz. Diamond Flavine. _Dark Navy_.--Give a medium indigo bottom in the vat, then mordant with 3 lb. fluoride of chrome and 1-1/2 lb. tartar, finally dyeing with 6-1/2 lb. Alizarine Cyanine G, and 1-1/2 lb. Alizarine Bordeaux G. _Dark Blue_.--Give a medium indigo bottom, then mordant with 6 lb. fluoride of chrome and 2 lb. oxalic acid, finally dyeing with 14 lb. Alizarine Cyanine Black. _Blue Black_.--Give a deep indigo bottom in the vat, then mordant with 3 lb. bichromate of potash and 2 lb. tartar, finally dyeing with (p. 160) 6 lb. Alizarine Cyanine Black and 1-1/2 lb. Alizarine Cyanine 3 R double. VIOLET SHADES ON WOOL. Violet shades can only be obtained from the coal-tar colours, and of these there are not many. The recipes which are given below will serve to show what dye-stuffs are available, and will give some idea of the tints they dye. #With Direct Dyes.# _Pale Violet_.--Prepare the dye-bath with 1/2 lb. Sulphon Cyanine, 1/4 lb. Geranine B, 5 lb. Glauber's salt, and 5 lb. acetate of ammonia, working at the boil for one hour. #With Basic Dyes.# _Violet_.--The dye-bath is made with 1 lb. Methyl Violet 3 B, and 10 lb. Glauber's salt. A fine pure shade of violet is obtained. Methyl Violet is made in many brands, distinguished as B, B B, 2 B, 4 B, etc. By using either one or the other of these, a variety of tints of violet, from a red shade with Methyl Violet R through violet (B) to a violet blue with Methyl Violet 7 B, can be dyed. #Puce.#--A very bright shade of puce is dyed by using Methyl Violet R, and 10 lb. Glauber's salt. #With Acid Dyes.# _Violet_.--Make the dye-bath with 2 lb. Acid Violet 4 B S, 10 lb. Glauber's salt, and 2 lb. sulphuric acid. This gives a pure violet shade. If Acid Violet 6 B S be used a bluer shade is obtained. _Reddish Puce_.--A very bright red tint of puce is obtained by using 2 lb. Acid Violet 4 R S, 10 lb. Glauber's salt, and 2 lb. sulphuric acid. _Bluish Violet_.--Make the dye-bath with 3 lb. Acid Violet 5 B, 10 lb. Glauber's salt, and 2 lb. sulphuric acid, working at the boil for one hour. _Lavender_.--Use 4 oz. Acid Violet 5 B, 1 oz. Azo Fuchsine G, 1/16 oz. Fast Green bluish, 10 lb. Glauber's salt and 2 lb. sulphuric acid. _Deep Violet_.--A fine deep shade is obtained by using 2-3/4 lb. Chromotrop 6 R, 2-1/2 lb. Cyanine B, 10 lb. Glauber's salt, and (p. 161) 2 lb. sulphuric acid, working at the boil for one hour. _Mauve_.--Use 2 lb. Acid Mauve B, 10 lb. Glauber's salt, and 2 lb. sulphuric acid. _Bright Violet_.--Use 2 lb. Formyl Violet S 4 B, 10 lb. Glauber's salt, and 2 lb. sulphuric acid. _Bright Violet_.--Use 2 lb. Acid Violet 6 B N, 10 lb. Glauber's salt, and 2 lb. sulphuric acid. _Violet_.--Use 2 lb. Acid Violet N, 2 lb. sulphuric acid, and 10 lb. Glauber's salt.