We used to have this thread, yeah? I'll probably be the one to re-start all the shallow threads.
Anyway, I thought of this because I've just re-dyed my hair at home after forgetting to print out my groupon voucher and the hairdresser turning me away. Out-grown coppery parts are now a deep berry red again. I went with Live Luminance XXL who I bitched about here and who I still hate (it definitely didn't brighten up the black parts well) because the red dye that DOES work really well (Jerome Russell's Smart) doesn't sell in any shops near me.