The secret to Megan Fox & Angelina Jolie's perfect brunette hues? Brass off products, of course! If you didn't know, now you know. Our top picks include Matrix Total Results Brass Off Shampoo & Redken Color Extend Brownlights Blue Conditioner. These products counterbalance the brassy orange tones of brunette hair, revealing a cool, ashy brown shade. Essentially, blue toning shampoo erases brassy tones to reveal cool, neutral browns.