Ruderico

Don't worry, after a few weeks the hairs are grown again and you'll have brown eyebrows. I'd say you'd buy a brown eyebrow pencil and make them brown again. But if you don't like that, you can go to a beauty salon and let them dy your brows, but you can also do it yourself and use hair dy to color them.

I have the opposite problem, my brows are too light and have to dy them darker, I do it myself and I use commen hair dy of "Henna Plus". That you can't use that stuff on you eyebrows is bullsh*t, I've heard that the salons use the same stuff. They blend the different colors into your desired color (which you can do yourself too), but to protect the business they pretend that eyebrow dy is completely different.

Dying them yourself is a lot cheaper (you can do forever with one pack), but since you only need to color them once, I'd say you should buy a pencil or go to a beauty salon.