The effect of white phosphorus on SOS induction with hydrogen peroxide relative to the negative control (medium without mutagen). P₄ at a concentration of 62.5 μg / ml is a weak mutagen compared to peroxide. P4 at a concentration of 1000 μg / ml is lethal to microbes after 9 hours of incubation. In the control, SOS induction also slightly increases, which is associated with the growth of the culture and the accumulation of DNA (accordingly, the number of its damages also increases, even in the absence of the mutagen).