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A touch up sounds like just the thing that you need instead of a complete hair coloring; however, you might also want to consider going in a bit early for your regular coloring. As for the products that you did mention, they seem to be pretty much a temporary hair color. The term wand and comb are just alternate marketing terms for this method of application.
Hair color comes in a couple of varieties that are basically categorized according to how many shampoo sessions they can survive. Temporary hair color is the first type that can only last its first application and is completely washed off after the first shampooing itself. This type of hair color is extremely popular in the fashion circuit where models just need to change hair color for one show. The way that these colors work is by forming a superficial layer over the hair and does not penetrate the hair shaft. Incidentally, this is also the mechanism that will suit your current needs of a touch up. Semi-permanent hair color can usually last about four to five sessions of shampooing. These use chemicals that allow a certain degree of penetration into the hair shaft but this largely depends on the porosity of each hair shaft. This type of hair color is usually used as a transitioning medium before dye that is more permanent is used. Demi-permanent hair color goes a step further and lasts for about twenty-eight shampoo sessions and finally there is permanent hair dye. Permanent hair dye acts by oxidizing and completely destroying the melanin content of individual hairs and then infusing the coloring agent. This lasts as long as the old hair is still on your head; new growth of hair is not affected by the coloring and will remain in the old color.
As mentioned before, touching up of gray hair is best done by the use of a temporary hair color. It is important that you also maintain the health of your hair when you apply color. Hair is very sensitive despite its resolute strength and one of the things that you have to ensure is that the color that you using are not harming your hair in anyway by causing split end or breaks. Oil that is rich in vitamin E and essential fatty acids should also be part of your hair care repertoire. Almond oil is one of the most effective in this regard.
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