I've used Jazzing before and it didn't take the first time, it looked like a tint on my hair that could only be seen in sunlight. The second time, I did black, and it showed a little once it was dried. Of course it didn't last long. I am natural.
My sister who is relaxed is very bold with hers.
She puts it in, and gets lazy and washes hers out 5 hours later. She never washes it all the way out, and then when she dries it, it shows alot more.
Don't try this at home...lol It works for her, and she still has all her bra strap length hair on her head. I think she even put lime juice on her hair once before she applied the rinse, because she heard it would help the color take better. *shrugs*
With rinses, it doesn't have bleach or peroxide, so it won't work like a permanent color does. I believe its safe to try again, but maybe someone else can clarify.