Missed a Few Spots Coloring Hair Dark Brown

I dyed my hair black 2 days ago and I didn't leave it in long enough so it`s not as dark as I wanted it and I missed a few spots. How long until I can dye it again? I have naturally dark brown hair.

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You'll have to wait until you can't see anymore color loss when you wash your hair. (Look at the water in the bottom of the shower for it!) Dark hair colors have extremely dense color molecules. Your hair can only hold but so much of it.

Once the water runs clear when you wash your hair, you can apply more color.