What are the different hair colors and info on how they work? Like semi and demi ect...?

yahWhat are the different hair colors and info on how they work? Like semi and demi ect...?
Temporary hair color





A girl with purple colored hair.Temporary hair color is available as rinses, shampoos, gels, sprays, and foams among others. This type of hair color is typically brighter and more vibrant than semi-permanent and permanent hair color. Temporary color is most often used to color hair for special occasions and is often used in unusual shades for events, parties and Halloween.








Semi-permanent hair color


Semi-permanent hair dye has smaller molecules than temporary dyes, and is therefore able to partially penetrate the hair shaft. For this reason, the color will survive repeated washing, typically 4-5 shampoos. Semi-permanents contain no, or very low levels of developer, peroxide or ammonia, and are therefore safer for damaged or fragile hair.








Demi-Permanent hair color


Demi-permanent hair color is, in fact, permanent hair color that contains an alkaline agent other than ammonia (e.g., ethanolamine, sodium carbonate) and, while always employed with a developer, the concentration of hydrogen peroxide in that developer may be lower than used with a permanent hair color. Since the alkaline agents employed in dem-perms are less effective in removing the natural pigment of hair than ammonia these product provide little to no lightening of hair's color during dyeing. As the result, they cannot color hair to a lighter shade than it was before dyeing and are less damaging to hair than their permanent counterpart.








Permanent color


All ';permanent'; haircolor products and lighteners contain a developer, or oxidizing agent, and an alkalizing agent ammonia.





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





The ammonia opens the cuticle of the hair to allow the color pigments to penetrate deep into the hair shaft.





Permanent color is truly permanent and will not wash out, although it may fade. New hair regrowth will obviously be in the hair's natural color, meaning that regular monthly or six-weekly coloring will be essential for as long as the hair color is maintained.





Permanent haircolor is the only way to dye dark hair into a lighter shade, and it must be done in two parts: First, the hair is bleached, then color is applied.What are the different hair colors and info on how they work? Like semi and demi ect...?
semi permanent will wash out in about 28 washes. i don't know what demi is but permanet will not wash out therefore giving you roots. If you don't want roots and a temporary hair color go with the semi permanent. Plus its less harmful to your hair.
huh?