Dyeing process using a mixture obtained from an aerosol device comprising a liquid fatty, alcohol and surfactants

A device for dispensing a cosmetic mixture for dyeing keratin fibers, said cosmetic mixture comprising:

• a dye composition comprising at least one oxidation dye precursor,
• a oxidizing composition comprising at least one chemical oxidizing agent,
• at least one C8-C30 fatty alcohol that is liquid at room temperature and at atmospheric pressure,
• at least one amphoteric or zwitterionic surfactant, chosen from the compounds corresponding to formula (B′2):
• Ra″—NH—CH(Y″)—(CH2)n-C(O)—NH—(CH2)n′-N(Rd)(Re) (B′2)
• wherein:
• Y″ is chosen from —C(O)OH, —C(O)OZ″, —CH2—CH(OH)—SO3H, or —CH2—CH(OH)—SO3—Z″;
• Rd and Re are, independently, chosen from C1-C4 alkyls or hydroxyalkyl radicals;
• Z″ is a cationic counterion derived from an alkali metal or alkaline-earth metal;
• Ra″ is chosen from C10-C30 alkyls or alkenyl group of an acid Ra″C(O)OH, optionally present in hydrolysed linseed oil or coconut oil;
• and
• n and n′ are, independently, equal to an integer ranging from 1 to 3, and
• at least one compound chosen from non ionic surfactants comprising a lipophilic part comprising a saturated or unsaturated, linear or branched, C16 or C18 hydrocarbon-based chain, and a hydrophilic part comprising at least 20 mol of ethylene oxide, unsaturated C8-C40 fatty acid, in acid or salified form, or mixtures thereof;
• said device comprising:
• a first container containing the dye composition comprising at least one oxidation dye precursor, and
• a second container containing the oxidizing composition comprising at least one chemical oxidizing agent,
• wherein at least one of the dye composition and the oxidizing composition comprises at least one propellant gas;
• wherein at least one of the first and second containers is pressurized and equipped with a component for dispensing the cosmetic mixture of the dye and oxidizing compositions.