Snow is white, right? Not always. In the arctic and alpine regions, pink and red snow is
not an uncommon sight. The color comes from algae that live among the crystals.
However, snow has also been known to fall in tints of blue, green, gray, and black. On
Christmas of 1969, black snow fell on a 16,000-square-mile region of Sweden. The snow had
apparently accumulated local soot and pollution in its fall. When it was later examined,
it was found to contain DDT and PCBs. In 1953, glowing green snow fell near Dana,
California (USA). People who tasted the flakes reported a green persimmon flavor, but
many who touched the substance came up with rashes and severe itching. The source of the
green snow is still a mystery.