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NONE any commercially used optical brightener needs to be added to raw untreated material. Answer I'm not sure the first answer responded to the question asked. Optical brighteners, such as those used in laundry detergents, are synthetic fluorescent dyes. The syntheses of these dyes use various chemicals, depending upon the dye which is to be made. For example, the brightener known as Blankophar R is obtained by the reaction of 4, 4' diaminostilbene -2,2' disulfonic acid and phenyl isocyanate.

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โˆ™ 2018-02-27 19:22:56
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Q: What chemicals do you use for the preparation of optical brighteners?
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