HOW TO REMOVE DARK HAIR DYE: -6-10 Vitamin C Tablets, crushed into a powder -baby shampoo With powder in a bowl, form layer of baby shampoo on top, add a tiny bit of water (just enough to create a foamy paste), and stir well. Apply to hair: leave on for 1-2h. Wash out normally, condition well. {I've done this plenty of times: works well to remove colour enough to re-dye a slightly lighter colour. 2-3 treat's work best for black-dyed hair. Hope this helps! :D -bh}
