I agree with a curly q. I have never had problems with the permanent dye penetrating my hair, as long as my hair isn't wet. Washing/conditioning, etc. the day before makes no difference at all.

Permanent dye is quite strong!

Let us know if you have a problem, but I would be very surprised if you do, as long as the dye is permanent.
2/c. Coarse hair med. density.
Protein sensitive but can use occasionally
Highly porous. Color over grey.
Best 1st day method: Smasters!
Stylers: Mix Curls in a Bottle into everything for shine. Terrible pj
Sometimes try roller sets or use a curling brush - classic glamor.
Every day is a gift