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-3a Coarse hair med. density.
Highly porous. Color over grey.
I love all the Curl Junkie products. Still experimenting with gels and curl creams. Still hoping for 2nd day hair....
Every day is a gift