Various other browns may be obtained by combining the various direct browns together or with other direct dyes. The use of a yellow or orange will brighten them; that of a red will redden the shade; the addition of a dark blue or a black will darken the shade considerably. It may be useful to remember that a combination of red, orange and blue or black produces a brown, and by using various proportions a great range of shades can be dyed. _Black._--Prepare a dye-bath with 6 lb. Diamine black R O, 2 oz. Thioflavine S, 2 lb. soap, 10 lb. salt. Enter the cotton at the boil and dye for one hour; lift, wash and dry. _Black._--Prepare the dye-bath with 5 lb. Direct deep black E extra, and 1/2 to 1-1/2 oz. common salt per gallon of water. Dye at the boil for one hour. _Deep Black._--Prepare the dye-bath with 5-1/2 lb. Diamine deep black R B, 2 lb. soda, 20 lb. Glauber's salt. Dye at the boil for one hour; lift, wash and dry. _Black._--Prepare the dye-bath with 5 lb. Direct triamine black G X, 15 lb. Glauber's salt. Dye for one hour at the boil; lift, rinse and dry. In working for from two to three hours the dye-bath will exhaust completely. _Black._--Prepare the dye-bath with 5 lb. Oxydiamine black A, 20 lb. Glauber's salt, 2 lb. soda. Dye at the boil for one hour. _Black._--Prepare the dye-bath with 6 lb. Pluto black B. Dye at the boil for one hour with the addition of 3/4 to 1-1/4 oz. Glauber's salt, 1/2 to 3/4 oz. soda ash per gallon of liquor. To develop the shade it is necessary to dye in a boiling liquor. _Black._--Use 2-1/2 lb. Diamine jet black Cr, 2-1/2 lb. Diamine jet black R B, 2 lb. soda, and 20 lb. Glauber's salt, working at the boil for one hour. _Black._--Use 6 lb. Oxydiamine black N R, 2 lb. soda and 20 lb. Glauber's salt, working at the boil for one hour. _Black._--Use 6 lb. Columbia Black F B B, 3 lb. soda and 20 lb. Glauber's salt, working at the boil to shade. Besides the blacks given in the above recipes, there are other brands which are used in the same way, and vary slightly in the shade of black they give. All the direct blacks require working in strong baths to give anything like black shades; they all have, more or less, a bluish tone, which can be changed to a jetter shade by the addition of a yellow or green dye in small proportions, which has been done in one of the recipes given above. By coupling, chroming or developing, the direct blacks can be made to give full, deep and fast blacks, and examples of their use in this manner will be found in following sections. By using all the direct blacks in proportions varying from 1/4 to 1 per cent. of dye-stuff to the weight of the cotton they give greys of various tints and depths; a few examples of such greys will now be given. _Blue Grey._--Prepare the dye-bath with 1/2 lb. Oxydiamine black A, 1 lb. soda, 10 lb. Glauber's salt. Dye at the boil for one hour.