NaClO is stronger oxidizing reagent than H2O2. The reaction produces oxygen by oxidizing the peroxide to O2: H2O2 + NaOCl = O2 (g) + NaCl + H2O At least a portion of the oxygen produced is in the excited singlet state (ground state oxygen is a triplet); this phosphoresces as it converts to the ground state, giving off a deep red glow.
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