How to use Matrix ColorInsider Mix ColorInsider Color with the dedicated ColorInsider Oil-Cream Developer in a 1:1 ratio. Apply the mixture to the hair and let it process for 35 minutes. Once the processing time is complete, rinse thoroughly and enjoy vibrant, gorgeous, and healthy-looking hair. Matrix ColorInsider is a game-changer in the world of hair coloring, offering the perfect blend of performance, care, and innovation. Embrace the power of oil-infused color and take your hair color experience to the next level with Matrix ColorInsider.