A process for the preparation of a dye preparation but on the basis of the madder root

摘要

The present invention relates to a method for the production of a dye preparation from madder root, comprising extraction of madder root in water at a temperature below 70-75° C., preferably below 65° C., while providing oxygen to the reaction mixture of madder root in water to obtain the dye preparation and to the dye preparation thus obtained.