There are many different types of hair salons that one can choose to go to. There are the traditional walk-in salons where you do not have to make an appointment, rather you just walk in a wait for the next available hairdresser. Another option is to call a full-service hair salon and make an appointment with a stylist of your choice. Some hair salons specialized in certin areas such a hair color products coloring, up-dos with hair color creams and powders for formal occasions, cutting or styling. Which salon one chooses will determine the level of expertise being performed for the service. All these hair color products: temporary, semipermanent, deposits only/demi, and permanent, 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," is a chemical process involving the diffusion of the natural color pigment, hair color creams and powders or artificial color from the hair. This process is central to both permanent hair color and hair lighteners. All permanent haircolor products and lighteners contain both a developer, or oxidizing agent, and an alkalizing ingredient as part of their ammonia or an ammonia substitute, and henna products too. The purpose of this 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 hair color products containing the alkalizing ingredient is combined with the developer (usually hydrogen peroxide), the peroxide becomes alkaline and diffuses, or breaks up, through the hair fiber, entering the cortex, where the melanin is located. The lightening occurs when the hair color creams and powders, alkaline peroxide breaks up the melanin and replaces it with new color. Henna is a deposit-only hair color whose active component, lawsone, binds to keratin and is therefore permanent. Henna products may be removed with mineral oil; however, it is considered "permanent" because it does not wash out with shampoos or rinses. It is often mixed with other plant dyes, such as indigo, turmeric, and senna, to change the color. Allergy to henna is much rarer than allergy to permanent hair color products. It is also considered a conditioning treatment. The variety of hair color products is truly amazing nowadays, the market of related cosmetic products is abundant in all kinds of hair color creams and powders that differ in both price and quality. They are henna products that have gained universal acclaim and can actually boast a long history of successful usage. There are reliable accounts of henna products application in the times immemorial by the renowned beauties of human civilization. The reason why henna products still retain popularity is the fact that this is a totally natural product which is not very likely to cause detrimental effect on your hair like other hair color products with chemical constituent components.