I agree with aimless6poet. That is my understanding also - that using protein too soon after you color will fade the color.

It's good to use it in advance.

Hi PerriP! Glad you have emerged from lurkdom.
2/c and some 3A.
Protein sensitive but can use occasionally
Highly porous. Color over grey.
Best 1st day method: Super Soaker
Stylers: Mix Curls in a Bottle into everything for shine. Terrible pj
Sometimes try roller sets - classic glamor but I prefer my curls.
Every day is a gift