My husband, a chemist from MIT...( I am proud of him : ) ) says that when hydrogen peroxide bubbles, it is generating Oxygen...it spontaneously decomposes into H2O plus O2. When it does that, it changes the oxidation state. Aren't you glad you asked? Kathleen ------------------------------------------------------------------------------- Kathleen B. Bruce RN, BSN, IBCLC, LLL Leader Co-Owner Lactnet, E-Mail = [log in to unmask] LACTNET WWW site: http://www.mcs.com/~auerbach/lactation.html