Dyed hair -- be picky with your shampoo!
染色的頭髮 ——洗髮水要挑剔！
Most of the off the shelf shampoo are not good for dyed hair
大多數現成的洗髮水都不適合染色頭髮
The cuticle of coloured hair is normally “pulled opened” through the dying and perm processes, making the hair weak and prone to dryness. Dyed colour may also be washed away easily as the cuticle is “opened”.
Shampoo for coloured hair needs to achieve two objectives:
minimize colour loss during the washing process i.e. “colour safe”
prevent further damage and preserve the weakened hair strand
The choice of shampoo need to be ultra mild in order not to wash away the hair dye. It also need to be pH adjusted to at least 5.5 or below in order to help close up the cuticle to minimize colour loss and preserve moisture in the hair. After shampoo, then must use conditioner to coat the hair strand to preserve the opened cuticle.
染色頭髮的角質層通常在染色和燙髮過程中被“拉開”，使頭髮變得脆弱且容易乾燥。當角質層“打開”時，染色的顏色也很容易被洗掉。
染髮洗髮水需要達到兩個目標：
減少洗滌過程中的顏色損失，即“顏色安全”
防止進一步的損害，保護弱化的髮絲
洗髮水需要非常溫和，以免洗掉染髮劑。還需要將其 pH 值調整到至少 5.5 或更低，以幫助閉合角質層，以最大限度地減少顏色損失並保持頭髮中的水分。洗髮後，必須使用護髮素塗抹在髮絲上，以保護打開的角質層。
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