Tressa Colourage Gel The diverse color palette of 61 shades (included in 10 Tonal Series), plus 4 concentrates, blonding booster, and clear. It is easy to formulate the system. Features: Translucent, multi-dimensional tones with flawless gray coverage Long-lasting color that resists fading through state-of-the-art dye coupling technology Smooth, gel-like consistency for easy mixing and application Economical-mix 2 oz developer with every 1 oz of color Two developer consistencies to choose from for flawless application Mixing concentrates: Add 1/8 oz concentrate to every 1 oz of color. If more is needed, add another 1/8 oz to every 1 oz color. Remember to add 2 parts developer for every 1 part concentrate in your formula. To adjust tonal value, extra developer is not necessary. Clear: Add to color for pull through, extra shine and condition. Blonding booster: When adding to color formula, amount should not exceed up to 1/2 oz for every 1 oz of color. Add same amount of developer as you do blonding booster.