The Application of the Coal Tar Dyestuffs the Principles Involved And the Metho
The Application of the Coal Tar Dyestuffs the Principles Involved And the Metho
C M Whittaker
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If the job comes out too bad to return, the dyer suggests that it should be dyed black, which usually covers up the fades, because, as already stated, black does not often show up the difference between the faded and non-faded portions. The Lodge-Evans Process. The author has already given reasons in Section VIII. Why he does not consider this process of practical importance for the dyeing of wool, but he does consider that it will be of great utility in certain processes of union dyeing, so he... has reserved the full dis- cussion of this process for this section. The L, odge-Bvans process is so called after its co-patentees, Messrs. Lyodge and Evans, of Huddersfield, who took out two patents in 1914. The process depends on the fact that sodium sulphite will dissolve sulphide dyestuffs to a perfect solution, yet this solution has no dyeing properties. If ammonium sulphide or sodium hydrosulphite is now added to this solution the dyestuff reduces to its leuco compound, and will now dye silk, wool, and cotton at suitable temperatures.
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