PROCESS FOR DYEING A CELLULOSE BASED ARTICLE BY USING OF RECYCLED SULPHUR BLACK DYE

摘要

The present invention relates to a novel process for dyeing of a cellulose based article comprising recovery of Sulphur Black dyes in an effluent of a dyeing process, reducing the Sulphur Black dyes with sulfide free agents to form solubilized pigments in leuco form and using of the recycled dye in a subsequent dyeing operation.