Dye wash, also known as a wash-in color, is a special hair dye product that combines the functions of coloring and conditioning. This type of dye is usually contained in a shampoo, and it works by massaging the scalp and hair with the product, allowing the dye to penetrate into the hair shaft, thus achieving the coloring. Easy to use: No additional coloring tools are needed, and it can be used just like a regular shampoo, making it convenient and time-saving. Natural color The resulting color is relatively natural, suitable for those who want to slightly change their hair color or make a touch-up.