| abstract |
(57) [Summary] The present invention relates to a compound represented by the formula (1): One or more copper complex formazan dyes represented by the formula: At least one copper complex formazan dye represented by the formula: 1 , R 2 , Y 1 , and Y 2 are as defined in claim 1), a process for preparing said dye mixture and the use of said dye mixture to prepare hydroxy and / or carboxy groups. Methods for dyeing and printing amide-containing materials are provided. |