Red hair color fades the fastest.
If you’re a salon-assisted ginger, you might’ve noticed that your bright auburn lessens in intensity after a month or so. You’re not imagining things. When exposed to water, all dye molecules diffuse out of the hair a bit. But, since red ones are smaller than brown or black molecules, they slip away faster (blondes don’t have to worry about shade fade – bleaching removes melanin altogether, so there’s no hue to lose). This is one myth we wish was false!