Effect of various concentrations of H2O2 on whole blood. Lanes: a, no H2O2; b, 3% H2O2; c, 1.5% H2O2; d, 0.75% H2O2; e, 0.38% H2O2; f, 0.19% H2O2; g, 0.1% H2O2; h, 0.05% H2O2; i, 0.025% H2O2; j, 0.01% H2O2; and k, 0.005% H2O2. The red color (a) was changed to white (b and c) or brown (d, e, and f), or it was not changed at all (g, h, i, j, and k). The reading of the results was not visually hindered by the RBCs in the case of lanes b, c, and d.