Any professional keratin expert will tell you that it is necessary to wait nearly two weeks before you can color your hair.
Dying your hair right after the hair therapy will not let you get the full results. Your color will look patch or not take at all providing you dye it two weeks after the keratin therapy.
This will happen due to the fact that keratin will coat your hair. As a result, this will be more difficult for colors to penetrate.
It is a proven fact that coloring your hair after keratin therapy will not satisfy you. It is strongly recommended to color hair before applying keratin products.