Does exactly what a semi-permanant dye should
"I bought this to use around once a week in the shower before shampooing to refresh my colour between the proper permanent dyes. And it honestly works perfectly. It grabs onto the hair well (but it isn't fluorescent unless you're super blonde probably), and hasn't stained my pillowcases. It's obviously not going to work on natural hair unless it's light though, so don't expect it to magically lighten your hair."