AphroDiva I tried that once, but hair didn't came out as soft as it would normally be If I hadn't colored it prior to the treatment.
I m not sure why did that happen but I suppose that color residues might had been left and keratin could not penetrate or be stabilised...I don't know maybe it was too much 2 procedures in the row

Besides, after a couple of weeks color faded again, when it should normally last more than 6 weeks