Biolage Color Last's color care concentrate. A protective duo of soybean oil and stearic acid preserves color by enveloping strands in a protective barrier against aggressors. Infused and micro-dosed with soybean oil and stearic acid to cleanse and help prevent color fade for up to 4 weeks while adding shine. This nourishing shampoo protects hair from environmental damage and strengthens hair while hydrating. helps maintain the color depth, tone and shine for vivid color treated hair.