Watermelon snow, also called snow algae, red snow, or blood snow, is snow that is reddish or pink in color, with the slight scent of a fresh watermelon. It is caused by the presence mainly of Chlamydomonas nivalis, a species of green algae containing a secondary red carotenoid pigment (astaxanthin) in addition to chlorophyll. Unlike most species of fresh-water algae, it is cryophilic (cold-loving) and thrives in freezing water.Its specific epithet, nivalis, is from Latin and refers to snow.
algae turns snow pink... The algae oxidizes the iron in earths surface turning it red and when it snows the snow becomes pink!!!! ~ NOTHING could be more PERFECT ~