FIELD: chemistry.
SUBSTANCE: invention relates to a method of neutralising the colour of a treating composition when reusing and remixing the treating composition. The treating composition contains a chromophore selected from a group consisting of mono-azo-, triarylmethane, xanthene, anthraquinone, hydrophobic dyes and mixtures thereof. The hydrophobic dyes are selected from a group consisting of benzodifurans, methane, triphenylmethanes, naphthalimides, pyrazole, naphthoquinone, mono-azo dyes, di-azo dyes and mixtures thereof. The method involves steps of: i. providing a mixing vessel with the treating composition which contains chromophore; ii. providing in the mixing vessel more than 0.045 wt % reducing agent selected from a group consisting of sulphite, thiodiurea, formaldehyde bisulphate, formaldehyde sulphoxylate and mixtures thereof; and iii. mixing until decolouration by neutralising the colour of the chromophore.
EFFECT: invention enables to reuse and mix a treating composition containing chromophore.
12 cl, 3 tbl, 3 ex
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