Me - RC #15. I am 80+% resistant gray/white. Karin on RC site advised me to use a more saturated solution (more powder in the same amount of water) and keep it on for 60 minutes and that works. I keep it on for 45-50 with a heatcap and draw through for 5-10.

Before RC I used Clairol Jazz (inconsistent color results) or Beautiful Browns (extremely temporary). Also used Natural Instincts; great color but the chemicals were to harsh.
My blog -

Playing with my hair is a hobby. Fluffy, fine natural 4a. Goal= Healthy, beautiful hair that retains its length.
Hear that crash? It's me falling off the CG wagon.