I look for areas of gray- could be roots only or could be a few areas that the gray moved down the shaft- and do those, and searching for those areas can take almost the whole dye time, so when I have all the hot spots covered, I finish off the rest of my hair in case there has been some color fade.
I would never comb it through, though. My hair is in a weird, tangly damp state when I dye so combing would be impossible; I would never be able to get a comb through the curls and tangles as the dye itself isn't slippery to help it along.
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