Product based on inorganic or organic particles bearing an indoline-based product

Product in powder form consisting of particles, the particles being inorganic or organic particles less than 200 microns in size, the product containing, in or on the particles or in and on the particles, an indoline-based product obtained by oxidative polymerization employing an indoline, the indoline corresponding to the formula ##STR3## in which:

• R.sub.1 and R.sub.3 represent, independently of one another, a hydrogen atom or a C.sub.1 -C.sub.4 alkyl group;
• R.sub.2 represents a hydrogen atom, a C.sub.1 -C.sub.4 alkyl group, a carboxyl group, a C.sub.1 -C.sub.4 a alkoxy carbonyl group, or an n-alkylamino radical;
• R.sub.4 denotes a hydrogen atom, a C.sub.1 -C.sub.4 alkyl group, a hydroxyl group, a C.sub.1 -C.sub.4 alkozy group, an amino group, a C.sub.1 -C.sub.10 alkylamino radical or a halogen atom;
• R.sub.5 denotes a hydrogen atom, a hydrozyl group, a C.sub.1 -C.sub.4 alkoxy group or an amino group;
• at least one of the radicals R.sub.4 or R.sub.5 denoting a hydroxyl, alkoxy or amino group:
• with the proviso that when R.sub.5 denotes an amino group, R.sub.4 cannot denote an alkylamino radical:
• or
• R.sub.4 and R.sub.5 attached to the carbon atoms joined together form a C.sub.1 -C.sub.2 alkylenedioxy ring, at positions 5 and 6;
• as well as the cosmetically acceptable salts.