Method for treating hair comprising the application onto hair of polymeric layer(s) which can removed to a large extent or even totally in an easy manner upon request of the user by using oxidizing composition.

In an embodiment, the present invention is a treatment sheet for separating portions of hair during a color processing treatment. In the embodiment, the treatment sheet is clear and transparent.

The invention relates to a foil (14) for a strand (12) of keratinic fibers including a first sheet (20) and a second sheet, the first sheet (20) being connected to the second sheet by an articulation, in particular a hinge, the first sheet (20) being movable relative to the second sheet between a closed configuration for illumination of the strand and an open configuration. The first sheet (20) is substantially at least partially transparent to the UV-visible light, and the second sheet (22) is substantially at least partially opaque to the UV-visible light.

Method for producing a shading on the hair, comprising the stage consisting in: subjecting an amount of a composition (100) capable of exhibiting a variation in its hair dyeing or bleaching power under the effect of a chemical and/or energy stimulus to the said stimulus, so as to obtain at least two fractions (1000; 2000) of the said amount each having a hair dyeing or bleaching power distinct from that of the other fraction, the composition (100) being subjected to the stimulus before or after it is brought into contact with the hair and the composition producing, after exposure to the said stimulus and being brought into contact with the hair, a shaded dyeing or bleaching.

Provided is a method for treating a fiber, including: imparting a pattern from a diffraction grating onto a fiber surface. The pattern is capable of diffracting incident polychromatic light into one or more dispersed visible colors, the fiber is not coated and the pattern is imparted directly onto the surface of the fiber.

The present invention relates to a process for bleaching or dyeing keratin fibers, in particular human keratin fibers such as the hair, comprising a step of application, to said fibers, of a composition (A) containing one or more chemical oxidizing agents and a step of irradiation of said fibers by means of UV-visible radiation having a wavelength ranging from 200 to 800 nm and a fluence ranging from 1 to 5000 J/cm.sup.2, after application of said composition (A); when the process is a process for dyeing keratin fibers, then one or more oxidation dyes is or are also used.

The present invention relates to a process for bleaching or dyeing keratin fibres, in particular human keratin fibres such as the hair, comprising a step of application, to said fibres, of a composition (A) containing one or more chemical oxidizing agents and a step of irradiation of said fibres by means of UV-visible radiation having a wavelength ranging from 200 to 800 nm and a fluence ranging from 1 to 5000 J/cm.sup.2, after application of said composition (A); when the process is a process for dyeing keratin fibres, then one or more oxidation dyes is or are also used.

The present invention relates to a device and method for selectively bleaching or dyeing a plurality of locks of hair. The device basically comprises a selector comb for selecting the locks to be treated from a portion of hair, and a container provided with at least one compartment that can internally house at least one liquid or pasty product for dyeing or bleaching. The selector comb is partially introduced inside the container and is movable inside and along same, being coupled thereto such that in an operating position of the device, the movement of the comb takes place, causing the gradual introduction of an increasingly longer portion of the locks selected by the comb inside the container at the same time as the gradual opening and communication of the inside of the compartment with the portion of the locks introduced therein, said portion being exposed to the liquid or pasty product.

Provided are a hair dyeing method which causes a particular portion of hair to attain a different color than the overall color, and hair which is thus manufactured. The method includes steps of (a) applying a first dye to a plurality of hairs, (b) dividing the plurality of hairs, to which the first dye is applied, into specific units of hair, (c) marking a section in the specific unit of hair which will not be dyed, (d) tying the marked section in the specific unit of hair, (e) injecting water into a dyeing apparatus which is to be used in applying a second dye, (f) heating the water which is injected into the dyeing apparatus, (g) injecting a chemical and a dye into the water which is injected into the dyeing apparatus and heated, (h) introducing the specific unit of hair to be mixed with the water which is injected into the dyeing apparatus, (i) gradually raising a temperature of the water which is injected into the dyeing apparatus, (j) when the temperature of the water which is injected into the dyeing apparatus rises to a certain temperature, maintaining the temperature of the water for a certain duration of time, (k) verifying the color of the specific unit of hair, and repeating the step (g) when the color of the specific unit of hair is not a designated color, and (l) when the color of the specific unit of hair is the designated color, stopping the heating of the water which is injected into the dyeing apparatus, and draining the water from the dyeing apparatus.

Method for treating hair wherein a first hair treatment composition is applied to the hair, e.g. the hair roots and a second hair treatment composition is applied to the hair, e.g. the hair lengths and tips, wherein the pH of the second hair treatment composition is higher than the pH of the first hair treatment composition.