The Dyeing of Cotton Fabrics: A Practical Handbook for the Dyer and Student

by Franklin Beech

2. The commercial 77 per cent. soda must always be used, and for practical purposes it may be taken as pure. It is best to make a solution which contains 160 grams NaOH in a litre of water.

3. The nitrite supplied is almost chemically pure, and is easily soluble in water. In order to make a solution 140 or 290 grams are dissolved per litre.

4. Crystallised acetate of soda contains 3 molecules of water of crystallisation, and is usually somewhat moist. Instead of 136 grams 140 are taken to allow for moisture. The amount is dissolved in about 500 cubic centimetres of water.

Bases.

1. Aniline, C₆H₅NH₂—93.
2. Toluidine, C₇H₇NH₂—107.
3. Alpha-and beta-naphthylamine, C₁₀H₇NH₂—143.
4. Para-or meta-nitroaniline, C₆H₄NO₂NH₂—138.
5. Nitro-para-toluidine, C₇H₆NO₂NH₂—152.
6. Amidoazobenzene (base),

C₆H₅N:NC₆H₄NH₂—197.
7. Orthoamidoazotoluol (base), C₇H₇N:NC₇H₆NH₂—225.
8. Alpha-or beta-naphthol C₁₀H₇OH—144.

Example of Quantities Taken.

Molecular Weight.

1. Molecule nitrite 69 grams.

2. Molecule aniline 93 "