. A manual of dyeing: for the use of practical dyers, manufacturers, students, and all interested in the art of dyeing . shand 750 grms. sodium acetate in 8 litres water, and diluted to 56 to 65 diazo-solution is used in the same quantities as the naphthol solution. For Nitrosamine red () the following instructions are given :—For 50 lbs. yarn,650 grms. beta-naphthol, 650 grms. caustic soda lye (72° to77° Tw.), and 2 kgs. Turkey-red oil F are dissolved and diluted to 23 the first lot of 2 lbs. yarn, 7| litres of this solution and 7^ litres water areused, and for e
. A manual of dyeing: for the use of practical dyers, manufacturers, students, and all interested in the art of dyeing . shand 750 grms. sodium acetate in 8 litres water, and diluted to 56 to 65 diazo-solution is used in the same quantities as the naphthol solution. For Nitrosamine red () the following instructions are given :—For 50 lbs. yarn,650 grms. beta-naphthol, 650 grms. caustic soda lye (72° to77° Tw.), and 2 kgs. Turkey-red oil F are dissolved and diluted to 23 the first lot of 2 lbs. yarn, 7| litres of this solution and 7^ litres water areused, and for every fresh lot of 2 lbs. 600 naphthol solution are addedAfresh. For developing, 2,400 grms. Nitrosamine in paste are mixed with 15litres water (18° C.) and 900 grms. hydrochloric acid (32° Tw.). A pale yellowprecipitate is formed, Avhich should dissolve within ten minutes, leaving onlya slight quantity of buff-coloured froth, which is scummed off. Immediatelybefore use 800 grms. sodium acetate in 10 litres water are added, and thewhole is diluted to 32 litres. The temperature of the liquor should be kept. Fig. 67. between 15° and 22° C. For developing the first 2 lbs. yarn, 7 litres of thissolution and 8 litres water are required, and for each further lot 1 litre ofsolution is added. After developing, the yarn is soaped for fifteen minutes at60° C. in a solution of 1,200 grms. neutral soap in 350 litres water; for bluershades of red, with soft soap, or it is soaped a second time with 5 kgs. Turkey-red oil F and 600 grms. soda ash. 2. Paranitraniline Red on Piece Goods^—This is dyed practically like a bluish-red, for instance, 2\ kgs. beta-naphthol and 200 grms. (2 : 7) naph-thol sulphonic acid F are mixed with 2^ kgs. caustic soda lye (75° Tw.), and•dissolved by adding 3f litres boiling water; 2\ litres cold water and 5 soap (see p. 679), dissolved in 25 litres hot water, are added, and thewhole is diluted to 100 litres. A more yellowi
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