Colored rain

From Glossary of Meteorology

colored rain

Rain that leaves a colored stain on the ground and on exposed objects, often red or rusty in hue.

The coloration is usually the result of rain picking up particles as it falls through a dust-filled subcloud layer. The subcloud layer, usually rich in iron oxide, may originate from an area far from the observed colored rain event. This phenomenon has been observed frequently in Italy with particles advected northward from the Sahara.
See blood rain.

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