The individual whose hair is very coarse may take longer to process because the formula has further to penetrate in order to begin truly working the way it’s meant to do. Conversely, a person with very fine-textured
hair could easily have their hair damaged by even half the processing time that would be needed for their coarse-textured counterparts.
Individuals whose hair is resistant have hair that doesn’t readily allow moisture to pass through the cuticle layer. Since these chemicals involved are moisture-based, resistant hair means that the color formula
won’t pass through the cuticle easily, and may not process properly. A common example of this is gray hair, which becomes more resistant as it loses its natural pigmentation. Many individuals with gray hair comment
that they cannot seem to get good color results because the color doesn’t want to “take” in their hair. Resistance is the problem.
Finally, hair that has already been damaged by some other process (whether chemical service or heat styling, etc.) can easily become more damaged and should generally be treated VERY carefully when attempting a new
chemical service on the damaged hair. It becomes another case where you never want to turn your back on it, and you also want to make sure to take and formulate as gentle a mixture as possible to use on the damaged hair.
One final thing that can affect the hair color process is cleanliness. Hair color should only ever be applied to clean, dry hair. If the hair is soiled or oily, the color will not penetrate and develop evenly and you will
have splotchy results at best. The hair must also be dry so that you can have some control over the application of the formula. When you try to apply color to wet hair, the color won’t absorb so quickly and you will once
again get splotchy results.
Bad Hair Color Reactions
Finally, the last hazard we’ll discuss regarding this subject is bad color reactions. These occur when the operator applies a color to a client without making note of the current color, and at least asking the client
about other colors he or she may have used.
If a client has used a color formula on their hair with a specific base color (let’s say blue), and in an attempt to go blonder uses a color formula with a gold base color, you may very well find yourself staring down at a
head full of green-tinted hair.
Such reactions often require additional services known as color-correction, and green is only one such possibility of reaction. Those who are blonde may end up brassy because their color is too yellow or orange. And those
who are brunette could end up mousy and flat if they over-process their color and it gets too dark. (This is a common problem for brunettes, attempting to cover their gray.)