Use of an indigoid compound in a cosmetic composition, in particular a make-up composition, in order to confer on it antimicrobial properties and the property of lengthy hold over time

A method of producing an antimicrobial cosmetic composition comprising mixing at least one indigoid compound of formula:

• in which:
• R1 and R′1 are, independently of one another, saturated or unsaturated, linear branched or cyclic alkyl radicals having 1 to 18 carbon atoms which are optionally substituted by one or more halogens and/or by one or more hydroxyl radicals and/or interrupted by at least one heteroatom selected from the group consisting of oxygen, sulphur, nitrogen and silicon;
• R2, R′2, R3, R′3, R4, R′4, R5 and R′5 are, independently of one another, chosen from hydrogen atom, a halogen atom, a hydroxyl radical or a saturated or unsaturated, linear or branched, alkyl alkyloxy, acyl or acyloxy radical having 1 to 6 carbon atoms, in a cosmetic composition.

Cosmetic composition comprising, in a cosmetically acceptable medium, at least one non-volatile silicone oil and at least one indigoid compound of formula:

• in which:
• R1 and R′1 are, independently of one another, saturated or unsaturated, linear, branched or cyclic alkyl radicals having 1 to 18 carbon atoms which are optionally substituted by one or more halogens and/or by one or more hydroxyl radicals and/or interrupted by at least one heteroatom selected from the group consisting of oxygen, sulphur, nitrogen and silicon;
• R2, R′2, R3, R′3, R4, R′4, R5 and R′5 are, independently of one another, chosen from a hydrogen atom, a halogen atom, a hydroxyl radical or a saturated or unsaturated, linear or branched, alkyl, alkyloxy, acyl or acyloxy radical having 1 to 6 carbon atoms.