If you leave hairdye on for longer than the time expected does it become darker?

Question

If you leave hairdye on for longer than the time expected does it become darker?

Answer 1

your hair will take better but I would not go over the time limit by too much or you'll end up with fried hair for breakfast. lol

Answer 2

Yes. On these ones I get it says leave for 15 min but leave for 20 for extra darkness... it doesnt say exactly that tho, that wud be retarded. so im guessing yes. but dont go overborard haha. have  u gone off the blonde thing already?? put photos on facebook i wanna see!

Answer 3

After about 35-40 minutes of it being on it is not going to get any darker  

Answer 4

Never exceed the time it says on the pack, but if it says it dyes in 15 minutes and you keep it on for 30 then it does seem to take better. They tell you to keep it on longer if covering greys or roots.

Answer 5

The development time is put there for a reason.

To reduce your chances of getting a reaction from hair dye and damaging your hair by over processing , do not leave hair dye in longer than advised