Semi-permanent dye is a type of hair color that lasts longer than temporary dyes but does not provide the long-lasting effects of permanent dyes. It typically lasts for about 4 to 12 washes, depending on the hair type and the product used. Semi-permanent dyes do not contain harsh chemicals like ammonia, making them a gentler option for coloring hair. This dye works by coating the hair shaft rather than penetrating it, which allows for easy application and removal. It is often used for adding vibrant colors or enhancing natural shades without the commitment of permanent coloring. Popular brands include Manic Panic and Clairol.