White DOD label/sign indicates:

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The white portion of a DoD hazard label flags substances that are toxins, poisons, or infectious materials. This white panel is used to indicate special toxic or biological hazards, distinguishing them from other hazards that are signaled by the colored sections (such as flammable, corrosive, or reactive materials). Because toxins and infectious materials pose serious exposure risks, handle them with strict precautions, using appropriate PPE and following the material’s safety data sheet and DoD handling procedures. This labeling helps ensure you treat the material as highly hazardous and apply the correct containment and decontamination measures, rather than misinterpreting it as a general toxic material or something like radioactive or explosive material, which have different indicators.