There are many reasons that women want to dye their eyebrows, two more common than others. The first is to make their eyebrows closer to the new lighter or darker hair color they are going for with the dye they are ready to apply. The second is that their eyebrows have gone grey or silver before their hair, leaving them with their natural shade eyebrow in the front and grey in the wing over each eye. It is nice to get rid of the grey scattered throughout your beautiful eyebrows.
If you look at the hair on your eyebrows, you will see it is not as fine as the hair on your head. Not as much color will be absorbed. If you want to try this yourself, you can use a q-tip that you’ve dipped into the hair color dye that is left over. Carefully rub it on your eyebrows, but don’t put on so much it will drip. Hair and eyebrow dye is very dangerous and can blind you if it gets in your eyes. Before rinsing out your hair, use a damp paper towel or sponge to wipe off your eyebrows.
You may have seen someone using an old toothbrush to dye their eyebrows, angling up and away from the face. Although that gives some great coverage of the eyebrow, there is still the chance of some getting in your eyes and causing serious, permanent damage. There are lash and brow dyes, which are a bit safer. If you need glasses to see, or shake a bit doing close work, it might be hard to dye your eyebrows safely. Find a qualified cosmetologist to have your brows dyed professionally. They are trained for that, and have the advantage of looking directly at you while they apply the dye safely.