On the instructions it says 25-35 mins
25- for little gray
35- for lots of gray
what if I leave it for 45 mins, would that be good,,,
My hair color at this moment is reddish brown, and I want it to be fire red,
I bought the color Hot Tamale from L'oreal

however long you put it on.. it won't stay red for long.. red is the color that fades a ton. and I have used loreal..long time.. do you have gray hair? or does it just say 25-35 mins? I would say 30 minutes.. and start the clock second you are done applying.. and don't put it on your hair too long it can turn it funny colors

If you want the color to look really dramatic, leave it on longer. No longer than 45 minutes though because it may damage your hair. I recently dyed my hair from a dark brown to a light red and had to leave it on about 45 minutes to really acheive results. If it burns, wash it out immediatley. But you should be fine. Hope it turns out good!