Verfahren zum Bleichen von Haaren durch Bestrahlung mit einem Laser, sowie die Vorrichtung

摘要

A process and device are claimed for the cosmetic partial or complete lightening of hair colour. Hair is irradiated a lock at a time by passing through a laser beam strong enough to degrade the melamine in the hair, but not so strong that the keratin is damaged. Keratin in dark hair is degraded at a lower energy density than that in naturally light hair. Several irradiation passes are made on each lock of hair until the desired colour is achieved. The laser used has an energy density of 0.1-1.2 J/cm<2> at a wavelength of 532 nm. The energy density used varies, proportional to the wavelength.