Our black nourishing and smoothing hair care product is carefully formulated with sodium lauryl ether sulfate and 2, 4-diaminophenoxyethanol hydrochloride. Designed specifically for one-press dyeing, it can easily achieve even coloring and complete hair dyeing in just 15 minutes. Even beginners can operate independently without getting their hands dirty. The usage method is extremely convenient: 1. Clean the hair and keep it dry. 2. Apply this product evenly to your hair, ensuring that every strand is covered, and wait for 30 minutes for the hair dye to fully penetrate your hair. 3. Rinse your hair thoroughly with warm water until it is clean. Moreover, it is a combined dyeing and care formula that nourishes the hair strands while dyeing, fills the voids in the cuticles, improves dry and frizzy hair, restores the strong structure of the hair, and the special color protection technology reduces color fading after dyeing, locks in the luster of the hair color for a long time, and the hair quality remains soft, bright, smooth and not dry after dyeing.