Hair Dye. Tips for dying gray hair

If you dye your hair to keep those gray colors from showing through there are a few tips that you can use to keep your color for longer:

Stay out of the sun. The sun will fade the added color.
Drying your hair with a hair dryer will also lighten those colors you want to stay.
Some shampoos strip away the colors as well. Find a shampoo that is just for colored hair to keep your colors.