The color closest to your roots should be the darkest, but this isn't as easy to achieve as it sounds. Developer is the component of dye that brightens hair, and it is triggered by heat. This is the reason you can spot blondes getting their touchups under the salon's heat lamps — that heightened temperature works to make their flaxen shade more glorious.
The natural warmth of your body can also have this effect. So, the sections of your mane near your scalp are at risk, and could transform to shade much lighter than you and your colorist intended. "It's especially noticeable on reds," warned Friedman. To counteract this, your colorist should focus on making the midlengths of your mane particularly bright, wrapping those sections with plastic wrap to trap the heat inside the shaft and lift the color even more. This acts as a visual trick and will make your roots appear darker.
