Yellow-rain meaning

A powdery yellow substance that was reported in the 1970s and 1980s to drop from the air in Southeast Asia, claimed by the United States to be a fungal toxin used as a chemical weapon by the Soviet Union and later claimed by certain investigators to consist of the excrement of large swarms of bees.
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A highly toxic, yellowish, powdery substance found in Southeast Asia c. 1975-85, alleged by some to be a chemical warfare agent dropped from airplanes and by others to be contaminated bee excrement.
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