Oxygen Bleach Powder (Oxi-Boost)

Sodium percarbonate is the active ingredient in oxygen bleach powders, and its chemistry is worth understanding because it explains both why it works and why it's a safer alternative to chlorine bleach. Sodium percarbonate is a compound of sodium carbonate and hydrogen peroxide held in a crystalline structure. When it dissolves in water, it releases hydrogen peroxide, which then breaks down into water and oxygen. The sodium carbonate (washing soda) remains and acts as a mild alkaline cleaner. Neither breakdown product is persistent or accumulates in the environment.

The stain-removing action comes from the hydrogen peroxide releasing reactive oxygen species, which break the chromophore (color-producing) bonds in many organic stain molecules. This is why oxygen bleach works on colored stains — wine, coffee, berries, grass — without the fabric-degrading bleaching effect of chlorine on dye molecules. It's color-safe for most fabrics because it targets the stain molecule's color structure rather than reacting with the broader fabric chemistry.

The main handling precaution is the powder form. Dry sodium percarbonate is a mild oxidizer and lung irritant if inhaled in quantity — pouring it from the box in an enclosed space without ventilation is the exposure scenario to avoid. Once dissolved in water, the respiratory concern is minimal. Store the powder in a sealed, dry container: moisture triggers the reaction prematurely, releasing the hydrogen peroxide and degrading the product before it reaches the wash.

Sodium percarbonate is most effective in warm to hot water, where the hydrogen peroxide releases faster and the reaction is more complete. In cold water, it still works but more slowly — using it in a pre-soak with warmer water maximizes stain removal before the main cold wash cycle. For routine laundry boosting, adding 1–2 tablespoons to the wash drum with detergent is a simple, effective approach.