Organic Color Systems Intensifiers are designed to give deeper, brighter, more intense colors. Our Red Intensifier increases red tones and give the hair a brighter, more vibrant, and funky result. Add into all natural colors 4 to 10, all CR, BC, RC, FR and MH colors. Intensifiers can be used on their own when applied to pre-lightened hair as a semi-permanent color. They can also be added to conditioners and treatments as a temporary color. The lighter you lift the hair, the brighter the result and the edgier the color.