Hair coloring

Hair coloring

Hair coloring products generally fall into four catagories: temporary, semipermanent, deposit only/demi, and permanent. All these hair color products, except for temporary color, require a patch test before application to determine if the client is allergic to the product.

"Hair lightening" often referred to as "bleaching" or "decolorizing," which is a chemical process involving the diffusion of the natural color pigment or artificial color from the hair. This process is central to both permanent haircolor and hair lighteners.

All permanent haircolor products and lighteners contain both a developer, or oxidizing agent, and an alkalizing ingredeident as part of their ammonia or an ammonia substitute-is to:

raise the cuticle of the hair fiber so the tint can penetrate
facilitate the formation of tints within the hair fiber
bring about the lightening action of peroxide

When the tint containing the alkalizing ingredient is combined with the developer (usually hydrogen peroxide), the peroxide becomes alkaline and diffusdes, or breaks up, through the hair fiber, entering the cortex, where the melanin is located. The lightening occurs when the alkaline peroxide breaks up the melanin and replaces it with new color.

Temporary hair color-For individuals who wish to usde a sutle neutralizer for yellowing hair or to neutralize unwanted tones. The pigment molecules in temporary hair color are large and, therefore, don't penetrate the cuticle layer, allowing only a coating action that may b removed by shampooing.

Semipermanent hair color-formulated to last through several shampoos , depending ont he hair's porosity ( ability to absorb moisture). The pigment molecules are small enough to partiall penetrate the hair shaft and stain the cuticle layer.

Demipermanent hair color-Is formulated to to deposit but not lighten hair color. Its smaller than tint molecules and therefore is able to penetrate the hair shaft.

Permanent hair color-is mixed with developer and remains in the hair shaft until new growth of hair occurs. It's used to match, lighten, and cover gray hair. Permantent hair color enerally contain ammonia, oxidative tints, and peroxide.