Yellow DOD label/sign indicates:

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Yellow labels warn of a reactivity hazard: oxidizing properties. Substances in this category can release oxygen or otherwise promote rapid oxidation, which can ignite or intensify fires even without a flame. That’s why these materials must be kept away from fuels, reducing agents, and organic materials, and handled with proper storage and safety measures. In practice, you store oxidizers separately from combustibles, use compatible containers, and follow strict handling procedures. This is why the correct interpretation of the yellow DoD label is oxidizing agents, organic peroxide or oxygen.