Abstract: Disclosed is an azo compound represented by the formula (1) below, a salt thereof, or a copper complex salt compound thereof. (In the formula, R1 and R2 independently represent a hydrogen atom, a sulfonic acid group, a lower alkyl group or a lower alkoxyl group; R3-R6 independently represent a hydrogen atom, a lower alkyl group or a lower alkoxyl group; R7 represents a lower alkyl group or a lower alkoxyl group; and n represents 0 or 1.

Abstract: Disclosed is an azo compound represented by the general formula (1) or a salt thereof: wherein R1 and R2 independently represent a hydrogen atom, a lower alkyl group or a lower alkoxy group; and n represents 1 or 2. Also disclosed are a dye-containing polarizing film and a dye-containing polarizing plate, each of which comprises a polarizing film base material and the azo compound contained in the base material.

Abstract: Disclosed is an azo compound represented by the general formula (1) or a salt thereof: wherein R1 and R2 independently represent a hydrogen atom, a lower alkyl group or a lower alkoxy group; and n represents 1 or 2. Also disclosed are a dye-containing polarizing film and a dye-containing polarizing plate, each of which comprises a polarizing film base material and the azo compound contained in the base material.

Abstract: A novel process for dyeing human keratin fibers in the presence of an oxidizing agent, comprising applying to the fibers at least one anhydrous composition (A) comprising at least one fatty substance, at least one organic amine having a pKb less than 12 at 25° C., and at least one surfactant, at least one composition (B) comprising at least one oxidizing agent, and at least one composition (C) comprising at least one dye chosen from oxidation dyes and direct dyes; a multi-compartment device or kit, wherein at least one first compartment comprises the at least one anhydrous cosmetic composition (A), at least one second compartment comprises at least one composition (B), and at least one third compartment comprises at least one composition (C); and a ready-to-use composition for dyeing human keratin fibers, comprising at least 35% by weight of at least one fatty substance, at least one organic amine having a pKb less than 12 at 25° C.

Abstract: The method for simultaneously dyeing and permanent shaping of hair includes winding hair strands onto curlers; mixing a dye component (B) containing 1 to 10 percent by weight of one or more dye compound and an amount of a keratin-reducing substance with a shaping component (A) containing from 6 to 15% by weight of the keratin-reducing substance in a weight ratio of from about 1:1 to 1:10 to form a dyeing and shaping composition, which necessarily contains from 5 to 18% by weight of the keratin-reducing substance; then allowing the hair with the dyeing and shaping composition to act on the hair for an acting time sufficient for permanent shaping; after that, allowing a fixing composition to act on the hair for 1 to 40 minutes and then subsequently rinsing the hair. The dye component (B) contains 4,5-diaminopyrazole derivatives and certain aminophenol derivatives.

Abstract: The method for simultaneously dyeing and permanent shaping of hair includes dividing the hair into strands an winding the strands onto curlers: mixing a hair shaping component (A) containing from 6 to 15 percent by weight of a keratin-reducing substance with a dye component (B) to form a dyeing and shaping composition prior to application on the hair; treating the hair with the dyeing and shaping composition and then allowing it to act on the hair for an acting time sufficient for the permanent shaping; after that, treating the hair with a fixing composition; allowing the fixing composition to act on the hair from 1 to 40 minutes and then subsequently rinsing the hair. The dye component (B) contains at least one oxidative coupler compound and at least one oxidative dyestuff selected from a group consisting of certain 4,5-diamino-pyrazole derivatives and certain aminophenol derivatives.

Abstract: A method for color-revitalizing a color tone of hair that involves applying a color-revitalizing composition to hair previously dyed with an oxidative hair dye composition. The color-revitalizing composition, which has a color determined by the color of the oxidative hair dye composition and contains at least one direct dye, revitalizes the color tone originally obtained by after dyeing with the oxidative hair dye composition.