abstract |
A compound useful for dyeing acid-modified fibers, having the formula <IMAGE> where R5 is hydrogen, methyl or ethyl; R2 and R3 are each methyl, ethyl, beta -hydroxyethyl, beta -hydroxypropyl or benzyl; A- is an anion; m is 2 or 3 and n is 0.1 to 1 based on statistical averages. |