Blue-black is a hair color that can only be colored after bleaching, and the bleached hair fades quickly, and blue itself fades quickly, so blue-black hair will not last long.
Although blue-black hair can be bleached, it is recommended to dilute it. If you don't fade, the dyed color may be uneven, and it will be obvious after fading. Basic blue-black hair will turn yellow after fading, so the later fading will be close to yellow.
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Precautions:
Hair care products such as conditioner should be applied to the hair after dyeing, which can further soften the hair structure and promote the stability of dyeing. Further maintaining the brightness and luster of the hair color. If you want to make your hair shiny and elastic, you'd better use professional post-dyeing shampoo to keep the color on your hair. If you just want to keep your hair low-key, you can mix professional shampoo with daily shampoo.
Be careful not to use force when washing your hair. Massage gently with your fingertips when washing your hair, and don't rub your scalp hard. Although you will feel itchy and uncomfortable if you don't wash your scalp for a few days after dyeing your hair, you should still keep a gentle massage without gravity. I believe that washing away the dust and pollution from my hair will give me a fresh feeling.
Baidu encyclopedia-bleaching and dyeing hair