| Hair color and coloring combines the science of | | | | semi-permanent hair dyes can be absorbed by the |
| chemistry, biology, and cosmetics to create a palette | | | | hair shaft, and so they will not rinse out immediately. |
| of colors to enhance or replace natures handiwork. | | | | Because of their molecular composition, these dyes |
| People color their hair in order to eliminate gray, to add | | | | result in a very natural look because each strand |
| highlights, or to change their hair color. Sometimes | | | | absorbs color differently. |
| someone will change the color, and then change it | | | | Demi-permanent dyes remove some natural pigments |
| back to their natural hair color. You can color it yourself | | | | from the hair shaft, but not completely. You cannot go |
| or go to a salon. Methods for coloring vary all the way | | | | to a lighter hair shade with demi-permanent dyes, but |
| from a rinse that washes out quickly to a permanent | | | | your hair color will look more natural than with |
| color dye. Regardless of the method, the goal remains | | | | permanent dyes. Permanent dyes create chemical |
| the same: to achieve a new look. | | | | reactions in the hair shaft that sound like they belong in |
| The chemistry of hair coloring might help you decide | | | | a chemistry lab. The melanin in the hair shaft breaks |
| how you color your hair. The temporary hair color | | | | apart and the new hair color can settle in. This is a high |
| rinses do not penetrate the cuticle of the hair shaft | | | | maintenance coloring technique because new hair |
| because the molecules of pigment are large. This | | | | growth becomes noticeable in six weeks. It is your |
| makes it possible for you to rinse out the color after | | | | natural color. If you like your new color and want to |
| one shampoo. The semi-permanent dyes have | | | | maintain it, be prepared to become a lab technician |
| molecules that are smaller than the rinses. These | | | | again. High school chemistry lab was never like this. |