Color additives intermixable across SoColor and SoColor Sync hair color that provides pure, bright tones.

What It Does Exceedingly pure, bright tones, for intensifying a color result or for neutralizing brassy effects-from subtle to dramatic. SOBOOST shades will provide you unlimited customizable color results.

• Blue: Use when lifting to neutralize unwanted brassiness and when darkening to add cool tones • Red: Use to intensify your favorite red, red-violet and violet formulas • Copper: Use to boost vibrancy with auburns, warm browns and golden blondes • Yellow: Use to brighten brunettes and soften reds that are too strong

How To Mix: 1 ½ oz SOCOLOR or COLOR SYNC + ½ oz SOBOOST with 2 oz Matrix Cream Developer