Has anyone ever colored their hair soft black that has medium brown hair?

[Tabatha]

i actually have medium auburn hair, med. Brown with red tint to it, its my natural color! I want dark hair, but not too dark as i am fair skinned!! Im going with garnier bc i love their products, the hubby liked it when i used soft black years ago however i was thinking i should go with dark or darkest brown, what do you guys think, ps as we all know color tends to fade a little after a few washes as well, ty in advance for your opinion