The present invention relates to a method for dyeing hair fibres, in particular a method which involves coating hair fibres with a hair dye composition and directing radio frequency electromagnetic radiation to the coated hair fibres to cause heating within the coated hair fibres by dielectric loss. The present invention also relates to kits and appliances for use in connection with the method, as well as the use of radio frequency electromagnetic radiation in reducing the effective dye-treatment time for hair fibres. In one aspect, there is provided a method of dyeing hair fibres, said method comprising the steps of: i) coating one or more hair fibres with a hair dye composition; and ii) directing radio frequency electromagnetic radiation having one or more frequencies from 1 MHz to 300 MHz to the one or more coated hair fibres to cause heating within the one or more coated hair fibres by dielectric loss. Preferably, the hair dye composition used in step i) is a permanent or demi-permanent hair dye composition that may be prepared by combining a dye lotion containing one or more dye precursors and an activator solution containing an activating agent, wherein the activating agent in the activator solution converts the one or more dye precursors in the dye lotion to active dye agents.

The present invention relates to the use of one or more particular pyridinium salts for the treatment of keratin substances, particularly human keratin fibres such as hair. The invention also relates to a method for the treatment of keratin substances using said salts and optionally one or more chemical oxidizing agents. The invention also relates to a composition for lightening keratin substances comprising one or more pyridinium salts as defined hereinafter and one or more chemical oxidizing agents. The present invention also relates to one or more particular pyridinium salts and also to compositions containing them, especially compositions comprising a physiologically acceptable medium.

The present invention relates to the use of one or more particular pyridinium salts for the treatment of keratin substances, particularly human keratin fibres such as hair. The invention also relates to a method for the treatment of keratin substances using said salts and optionally one or more chemical oxidizing agents. The invention also relates to a composition for lightening keratin substances comprising one or more pyridinium salts as defined hereinafter and one or more chemical oxidizing agents. The present invention also relates to one or more particular pyridinium salts and also to compositions containing them, especially compositions comprising a physiologically acceptable medium.

The aim of the present disclosure was to provide an improved oxidizing agent preparation for oxidative color modifying agents, which are present as soap based gels and contain ammonia as the alkalizing agent and optionally at least one oxidation dye precursor, and have a pH in the range of from 8 to 11.5, measured at 20° C., with which homogeneous and viscosity-stable application mixtures can be produced that release less ammonia during the entire leave-in time. It was surprisingly found that aqueous hydrogen peroxide preparations which contain selected 1-alkanols, glyceryl fatty acid esters, ethoxylated fatty alcohols, polyols and oils, achieve said aim in a very satisfactory manner.

A combination of at least one select dicarboxylic acid having 2 to 10 carbon atoms, in combination with at least one amino acid, selected from arginine, lysine, histidine or at least one of the salts of these amino acids, are included in a blonding powder to reduce the damage caused to keratin fibers by an oxidative bleaching treatment.

A combination of at least one select dicarboxylic acid having 2 to 10 carbon atoms, in combination with at least one amino acid, selected from arginine, lysine, histidine or at least one of the salts of these amino acids, are included in a blonding powder to reduce the damage caused to keratin fibers by an oxidative bleaching treatment.

A combination of at least one selected dicarboxylic acid having 2 to 10 carbon atoms, in combination with at least one amino acid, selected from arginine, lysine, histidine or at least one of the salts of these amino acids, form a bleaching paste in order to reduce the damage to keratinic fibres caused by an oxidative bleaching treatment.

A combination of at least one selected dicarboxylic acid having 2 to 10 carbon atoms, in combination with at least one amino acid, selected from arginine, lysine, histidine or at least one of the salts of these amino acids, form a bleaching paste in order to reduce the damage to keratinic fibres caused by an oxidative bleaching treatment.

A hair cosmetic composition includes an alkaline agent and an oxidant, and is constituted as a hair dye or a hair bleaching/dye removing agent. The hair cosmetic composition further includes (A) a cellulose derivative and (B) a polyethylene glycol having a number average molecular weight of 2,000 or less. The mass ratio of the content of the (B) component to the content of the (A) component is 1 to 50.

A hair cosmetic composition includes an alkaline agent and an oxidant, and is constituted as a hair dye or a hair bleaching/dye removing agent. The hair cosmetic composition further includes (A) a cellulose derivative and (B) a polyethylene glycol having a number average molecular weight of 2,000 or less. The mass ratio of the content of the (B) component to the content of the (A) component is 1 to 50.