PRODUCTION OF WATER-SOLUBLE TRIPHENYLMETHANE DYE

    公开(公告)号:JPS6353283A

    公开(公告)日:1988-03-07

    申请号:JP20323987

    申请日:1987-08-17

    Applicant: BASF AG

    Abstract: A process for the preparation of a water soluble food-grade diaminotriphenylmethane colorant containing from 2 to 4 sulfo groups, comprising anodically oxidizing the corresponding leuco compound in an electrolysis cell divided into an anode space and a cathode space in the presence of from 0.01 to 2% by weight, based on the solution being oxidized, of a C2-C4-alkanol, urea, a urea derivative or a mixture thereof, at a potential epsilon h

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