PROCESS FOR THE PREPARATION OF METAL COMPLEX DYES

摘要

The invention relates to a process for the preparation of a metal complex dye under production conditions, which comprises reacting at least one dye with a metal donor, adding said metal donor or said dye discontinuously before the end point of the metallizing is reached, and determining the end of the metallizing voltametrically. The process makes it possible to prepare metal complex dyes in good yield and purity.