Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1326231A
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Individual
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Individual
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Priority to GB1326231ApriorityCriticalpatent/GB378045A/en
Publication of GB378045ApublicationCriticalpatent/GB378045A/en
Mixed materials are dyed with substantive dyestuffs while reserving the wool or silk by treating the material with the substituted acid amides specified in the parent Specification in a preliminary impregnating or reserving bath prior to dyeing whereby the wool or silk remains undyed. In an example, a cotton and silk material is impregnated with 10 per cent of the sodium salt of bis-(1 : 2-dichlorobenzene-4-sulphonyl-3<1>-aminobenzene-1<1> -sulphonyl-3<11>-aminobenzene-1<11>-sulphonyl)-benzidine-m : m<1>-disulphonic acid and 4 per cent of formic acid, rinsed and then dyed with Direct Deep Black R.W. in presence of sodium sulphate; the silk remains white.
GB1326231A1931-05-051931-05-05Process for dyeing with the reserving of wool or silk
ExpiredGB378045A
(en)