MATRIX Total Results Brass Off Shampoo is a neutralizing cleanser. It gives hair on pitches 5 to 8 a cooler look by neutralizing unwanted copper reflections in the hair. For best results, use Brass Off Shampoo immediately after bleaching/brightening and leave on hair for 2-3 minutes.Application: Gently massage the Brass Off Shampoo into damp hair, leave on for 2-3 minutes, then rinse thoroughly.