Yes, QOD Max can pull a bit of a coppery tone on your hair, but it will fade after a while. I think most Keratin treatments do. My girlfriend uses another brand and always pulls some coppery tones. I used another brand once and it pulled a lot more than the QOD Max. (This was when my hair was darker). Might be the protein/keratin in general?
You can throw in a semi permanent toner in two weeks after doing a treatment if you need/want to.
I used the Original QOD Max and sometimes it would pull some soft coppery tones. Never bothered me, because the end result was fantastic! I love that glow! And the color would look fresh at all time. If like it got sealed with the BKT.