CHI Color Illuminate Dark Chocolate Conditioner is recommended for natural or color-treated brown hair levels 4-6 to enhance warm chocolate tones. The color-enhancing conditioner is used to maintain hair color intensity between color treatments and to revive dull strands. The formula is enriched with olive oil and silk amino acids that protect, restore and nourish each hair strand. Usage. Apply conditioner to damp, towel-dried hair, distribute and leave for 1-5 minutes. then rinse thoroughly with water. Can be used daily. For long-lasting results, apply conditioner and leave for 10-20 minutes. Rinse.