| 21. | Furthermore, it is prohibited to place any textile or leather articles colored with azo dyes on the market.
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| 22. | All dyers should ensure that the supply company is fully informed about the legislation of the prohibited azo dyes.
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| 23. | Methyl orange is an example of an azo dye that is used in the laboratory as a pH indicator.
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| 24. | Azoic dyeing is a technique in which an insoluble azo dye is produced directly onto or within the fiber.
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| 25. | When the azo dye agent ( N-alpha-naphthyl-ethylenediamine ) is added a pink colour develops.
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| 26. | "' Chrysoine resorcinol "'is a synthetic azo dye which was formerly used as a food additive.
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| 27. | A strain of this species isolated from effluent from a textile factory was found to be able to degrade azo dyes.
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| 28. | Accordingly, the production of benzidine azo dyes was discontinued in the 1980s " in the most important western industrialized countries ".
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| 29. | Therefore, there may be a connection between the increase of the disease and the amount of usage of these azo dyes.
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| 30. | After contact exposure under light, the residual diazo is converted to a stable azo dye with an aqueous solution of coupler.
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