Clothesline Fresh Xtreme Oxygen Bleach is a 25% hydrogen peroxide-based active oxygen bleach that will get your whites white (like chlorine bleach) and keep your colors bright (which chlorine can't do). Overuse of Clothesline Fresh Xtreme Oxygen Bleach will not lead to unsightly yellowing like Chlorine Bleach will tend to do and will also biodegrade into water and oxygen after use in the wash cycle.