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The most common cause of colored snow is the growth of algae. One type of algae, Chlamydomonas nivalis, is associated with a red or green snow that may be called watermelon snow.
originally posted by: Bigburgh
a reply to: Mianeye
The article you linked states Iron in reaction to the oxygenated air, iron oxide / Rust.
I would have guessed Algae or trapped Red Tide if you will.
Thanks for posting. S&F👍