The background color of a placard that would signify a poisonous substance and that contains skull and crossbones is:

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Multiple Choice

The background color of a placard that would signify a poisonous substance and that contains skull and crossbones is:

Explanation:
Poisonous substances are marked with the skull and crossbones as the warning symbol for toxicity. In placard design, that symbol sits on a white background, which makes the toxic warning stand out clearly and distinct from other hazard signals. The other background colors are used to indicate different hazard classes and are not paired with the skull-and-crossbones poison symbol. So the white background is the correct sign for a poisonous substance. If you encounter this placard, treat the material as highly toxic and follow appropriate safety procedures.

Poisonous substances are marked with the skull and crossbones as the warning symbol for toxicity. In placard design, that symbol sits on a white background, which makes the toxic warning stand out clearly and distinct from other hazard signals. The other background colors are used to indicate different hazard classes and are not paired with the skull-and-crossbones poison symbol. So the white background is the correct sign for a poisonous substance. If you encounter this placard, treat the material as highly toxic and follow appropriate safety procedures.

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