Keune Semi Activator - Intense, formerly known as Red Color Activator is for use with Keune Semi Color, semi-permanent colors. It ensures proper development and stability for longer-lasting color. Semi Color Activator - Intense is a special developer used with Keune Semi Color. The Activator provides better stability and longer durability of the color. The Activator - Intense is used to intensify red shades on natural dark hair, color level 1-5. For optimal results use only Semi Color Red Activator with Keune Semi Color.