7-Benzothiazolesulfonic acid, 2,2-[(2-sulfo-1,4-phenylene) bis[imino(1-acetyl-2-oxo-2,1-ethanediyl)azo-4 ,1-phenylene]]bis[6-methyl-, compd. with α,α,α- (nitrilotri-2,1-ethanediyl)tris[ω-hydroxypoly (oxy-1,2-ethanediyl)] (1:3)