2. Protection from Hair Dye
One of the problems with DIY hair dyes is that they can discolor your skin. This is fine when it occurs on your scalp because it isn’t noticeable. It can be embarrassing, however, if the skin along your hairline or at your neck becomes stained.
Spread a little Vaseline anywhere you don’t want the dye to stick and you’ll have no problems with stains. Just wipe everything off when you are finished.