This question came up inside the Hair Science Hub and it’s SUCH a common mistake “Shouldn’t permanent colour last longer when going darker?” Not always. If we’re going darker on the natural hair — we don’t need lift. And when lift isn’t required, permanent colour can actually cause more problems than it solves. Lifting the natural hair Lifting the undercoat Resulting in root glow and less longevity In many cases, a semi-permanent can give better deposit, cleaner results, and more predictable lon
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