Dyestuff salts containing a cationic group derived from a sterically hindered amine

A compound of the formula I:

• F.sub.n.A (I)
• wherein
• F is a residue of a metal-free anionic dyestuff having 1-4 acid groups;
• n is 1 to 2;
• A is ##STR17## R.sub.4 is a group of formula (b) ##STR18## R.sub.5 is a group of formula (c) ##STR19## wherein Y is .dbd.*N--CO--;
• R.sub.5' is a group of formula (c) wherein Y is --*CO--N.dbd.;
• the *atom is attached to the piperidyl group;
• R.sub.6 is a group of formula (d) ##STR20## R.sub.7 is a group of formula (e) ##STR21## R.sub.11 is H or C.sub.1-4 alkyl;
• R.sub.12 is each independently C.sub.1-6 alkyl;
• and
• R.sub.13 is each independently H, methyl, or ethyl;
• or one is phenyl and the other is H, methyl, or ethyl;
• or both together form a group --(CH.sub.2).sub.5-11 --.