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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: ...of a basic cotton dyestuff, such as Methylene Blue, Methyl Violet, etc., may be added direct to the coupling bath. The cotton should be well rinsed after coupling. The following coupling baths may be used: Paranitraniline C (Ca.). For 100 lbs. of cotton dyed with 3 to 4 per cent. of dyestuff use 5 to 7 gallons diazotised paranitraniline C, f to 1 lb. soda ash, and 5 to 6J lbs. sodium acetate. Preparation of the diazotised paranitraniline C. 2 lbs. paranitraniline C; 1J gallons boiling condensed water; stir well, and add J gallon hydrochloric acid, 32 Tw.; stir until completely dissolved and add 3J gallons cold water. The hydrochloride of paranitraniline will be precipitated in the form of a yellow paste. Allow to cool, and when quite cold, add whilst continuously stirring lb. nitrite of soda dissolved in 1 gallon cold water. The solution becomes clear after about 20 minutes, and is now made up with cold water to 20 gallons. The diazosolution will keep for some time, but it must be stored either in wooden or earthenware vessels and protected from heat and sunlight. When using Nitrazol C (Ca.) in place of paranitraniline the solution is prepared by stirring the Nitrazol into a uniform paste with a small quantity of water, at 68 to 77 F. A sufficient quantity of cold water is then added to dissolve the Nitrazol completely. 3 to 4 lbs. Nitrazol C, to 1 lb. soda ash and 3 to 4 ozs. sodium acetate or 2 to 4 per cent. of Azophor Red or Azophor Orange (ML.) and 1 to 2 per cent. of sodium acetate may be used in place of diazotised paranitraniline for 100 lbs. of cotton, dyed with 3 to 4 per cent. of dyestuff. For the method of dissolving these substances, see p. 277. Coupling with Nitrosamine Red paste (Ba.). Mix 3J lbs. Nitrosamine Red...