Amika: Brass Cool Blonde Repair Shampoo  is a shampoo that tones brassy hues and helps hydrate your strands. Bond Cure Technology: An innovative complex that targets the most abundant bonds in hair. Helps you get a brighter blonde while you wash with this purple shampoo. It helps to repair and hydrate strands while toning yellow, brassy hues.

How do I use it: amika suggests applying the Bust Your Brass products on a test strip of hair at the nape of the neck before settling on a routine. For natural blondes (not color-treated): In the summer months (when hair is more likely to become brassy), use the shampoo every other wash.

For Platinum Blondes: To maintain tone, use the shampoo every other wash.

For highlighted, balayage, or natural-looking (color-treated) blonde hair: Use Bust Your Brass Shampoo every other wash. Assess hair's tone and pivot (increase or decrease usage) as needed.