_Dark Blue_.--Prepare a dye-bath with 1-1/2 oz. Acid Violet 5 B, and 1-1/2 lb. Fast Green Bluish, 10 lb. Glauber's salt, and 2 lb. sulphuric acid, working at the boil to shade; then lift, wash and dry. _Deep Blue_.--Make a dye-bath with 4 lb. Chromotrop 6 B, 10 lb. Glauber's salt, and 4 lb. acetic acid. Work for one hour at the boil; then lift, add 2 lb. bichromate of potash and 3 lb. acetic acid, re-enter the goods and work for one hour longer; lift, wash and dry. The blues produced from the Chromotrops according to the last (p. 155) recipe are full, solid-looking shades, and have a great degree of fastness to milling and light. Some other examples showing the production of blue shades from the Chromotrops will be given later on. _Violet Blue_.--Prepare a dye-bath with 2 lb. Victoria Violet 8 B S, 10 lb. Glauber's salt, and 2 lb. sulphuric acid, working at the boil to shade; then lift, wash and dry. _Deep Blue_.--A fine deep blue is dyed on wool from a bath containing 6 lb. Victoria Violet 8 B S, 10 lb. Glauber's salt, and 2 lb. sulphuric acid, working at the boil to shade. _Deep Sky Blue_.--A fine shade is dyed in a bath containing 4 oz. Cyanole extra, 10 lb. Glauber's salt and 2 lb. acetic acid. _Electric Blue_.--Make the dye-bath with 4 oz. Cyanole extra, 1 oz. Acid Green extra, and 10 lb. bisulphate of soda. _Bright Blue_.--A very fine shade of blue can be dyed in a bath containing 3 lb. Cyanole extra and 10 lb. bisulphate of soda. _Dark Navy Blue_.--Prepare the dye-bath with 4 lb. Cyanole extra, 9 oz. Archil Substitute N, and 10 lb. bisulphate of soda. _Dark Navy_.--Prepare the dye-bath with 5 lb. Black Blue O, 1-3/4 oz. Formyl Violet S 4 B, 4 oz. Patent Blue V, 25 lb. Glauber's salt, and 4 lb. bisulphate of soda, adding 1 lb. sulphuric acid when the dyeing is about half done. The navy blues given in the last few recipes possess the merit of considerable resistance to light, air and milling. _Pale Blue_.--Make the dye-bath with 1/2 oz. Chromotrop 2 R, 4 oz. Cyanine B, 7-1/2 oz. Fast Acid Blue R, 1/2 oz. Azo Yellow, 10 lb. acetic acid, and 15 lb. Glauber's salt. _Peacock Blue_.--A fine shade is dyed with 14 oz. Cyanine B, 1-1/2 lb. Fast Acid Blue R, 2 oz. Azo Yellow, 10 lb. acetic acid, and 15 lb. Glauber's salt. _Dark Invisible Blue_.--Make the dye-bath with 2 lb. Victoria (p. 156) Black Blue, 10 lb. Glauber's salt, and 3 lb. sulphuric acid. _Bright Blue_.--A very fine shade of blue, not, however, fast to light, is dyed from a bath containing 1/2 lb. Victoria Blue B, and 10 lb. Glauber's salt. _Bright Electric Blue_.--Prepare a dye-bath with 3/4 lb. Glacier Blue, 10 lb. Glauber's salt and 3 lb. sulphuric acid, working at the boil. This gives a very bright green shade of blue. _Dark Peacock Blue_.--Make the dye-bath with 1 lb. Naphthol Blue Black, 10 lb. Glauber's salt, and 3 lb. sulphuric acid.