You won't get copper from black without some serious peroxide either in a two step (bleach then semi permanent dye) or one step (professional type product) process, few if any commercial/ regular store box dyes will lift that far. The more shades you lift the more damage you do regardless if you do that in one process or multiple, but ALL permanent processing is damaging because it all contains peroxide.
Again do strand tests
, nobody here knows what condition your hair is in or whether a third process will damage it beyond what is acceptable to you. Two weeks is not some magic time limit, hair is dead it never permanently repairs itself. To limit the damage do hydrolysed protein treatments and coconut oil soaks.
2a-2c, medium texture, porous/ colour treated. Three years CG, growing out mechanical and chemical damage = breakage and very high porosity. Past armpit length heading for waist.
CO-wash: Inecto coconut
Treatments: Komaza Matani, coconut oil, Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss ultimate volume, Inecto argan
Styler: Umberto Giannini jelly, Boots Essentials gel
Experimenting with: going back to basics
Last edited by Firefox7275; 05-23-2013 at 02:33 PM.