Why did snow turn red in Carniola?
Gibb reported that red snow fell over three nights in March 1808 in Carniola and its neighbourhood, reaching a reported depth of five feet ten inches. It lay between earlier white snow and later ordinary snow, with the layers remaining distinct even as they melted; similar red snow was observed in the Valteline, Brescia and Tyrol mountains[1].
After the red snow melted and evaporated, it left a little finely divided, rose-coloured earth containing silex, alumina and oxide of iron. That residue was the observation; Gibb’s further suggestion that volcanic ash coloured the snow was an explanation he proposed, not a cause established by the report[2][3].
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