Natural - 2.1 oz, What it is: These five-minute highlight upgrades reduce strong contrasts. Integrated BondPro+ and Cool Protect technology ensure clearer, cooler, longer-lasting results. The Brightener lightens the darker natural hair just enough to soften the contrasts from natural to highlighted hair for a blended look in just 5 minutes. The integrated Cool Protect Technology controls the fading of dyes for longer lasting cool results.   What it is: LightDimensions BRIGHTENER NATURAL: Up to 1.5 levels of lift for levels 7-9 Toning neutral (Power Toning + @Pure Pigments) Contrast softener in between highlight services Natural result LightDimensions BRIGHTENER SILVER: Up to 1.5 levels of lift for levels 5-7 Toning cool Contrast softener in between highlight service Cool result