This hair color include a proprietary blend of keratin amino acids and pure silk amino acids that combine to provide long-lasting color and greater shine. It is a semi-permanent hair color with ten vibrant shades that are positively vibrant. Long-lasting, intense hair color that does not transfer onto other strands or into other colors. Strengthen hair's fiber and help color adhere to the hair shaft. Silk amino acids act as a color carrier to help drive color deep into hair's cortex. Simply apply to prelightened hair. Vivid hair color is easy to use- no developer required.