(Original post by sbreezy)
What would happen if I put it on again? I googled it & people have said its fine to use after a few hours but no longer
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Most box dye won't dramatically change you up a colour. And it sounds like your hair does not take dye well. Most dyes just deposit colour, and will use a tiny amount of peroxide to get the dye into the hair, but not enough to dramatically change colour, especially if your hair is not blonde.
I wouldn't recommend using it again. The chemicals would have reacted and the dye developed. You could try but it would be at the risk of your hair.
If you want a lighter colour you need to bleach bath your hair up a bit to then apply the colour.