Black hair dye can look harsh ... which can fade with time to give you a washed-out brassy look." The formula includes keratin, olive oil, and vitamin E, all of which help soothe the scalp ...
That's right, washing your hair is often framed as a key cause of fading color, but as it turns out, the answer to your burning question, "When can I wash my hair after dyeing it?" is less about ...