Has anyone used coffee to dye their hair?

I’m looking for natural ways to dye your hair?
Not chemist dyes or health food shop dyes, but natural earth dyes.
I’ve heard that coffee works?
I’d like to dye my hair black – it’s brown.
Has anyone used coffee?
Or does anyone know of anything else that works?

I’m not allergic to chemist dyes, I just want to avoid them if I can.