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It is generally safe to eat snow or use it for drinking or for making ice cream, but there are some important exceptions. If the snow is lily-white, you can safely ingest it. But if the snow is colored in any way, you’ll need to stop, examine its color, and understand what it means.

Snow is still great, just refrain from eating it! The study revealed that from just one hour of exposure, the levels of pollutants within the snow increased dramatically, with toxic particles becoming trapped within the small ice particles or dissolved within the pockets of melted snow.

And “never eat snow that’s been plowed,” advises Mark Williams of the Institute of Arctic and Alpine Research at the University of Colorado. It’s likely to contain sand and chemicals such as magnesium chloride. “All this gets incorporated into the plowed snow and is bad for you.”

When snow and ice accumulate, it can become heavy and cause building damage or water damage. Snow and ice can collapse roofs, especially on older buildings. Snow that builds up on walls and windows can cause water damage if it melts and leaks in through improperly sealed windows or into the basement.

The thing about snow is that it really doesn’t have a taste you can describe. It’s essentially flavorless, though it reminds people of the crisp smell of winter air with a slight metallic quality.

Freshly melted snow is generally considered to be safe to drink without further treatment, however it should not be assumed that because water is frozen that it is safe to drink. Exercise the same caution for melted Ice as you would for standing water, and if in doubt boil the water for 10 minutes.

Boiling – If your heat source is a stove or fire, then your easiest method of purification is probably going to be boiling. Simply bring your water to a frothy, rolling boil and let it continue boiling for at least 5 minutes.

Snow is composed of frozen water crystals, but because there is so much air surrounding each of those tiny crystals in the snowpack, most of the total volume of a snow layer is made up of air. We refer to the snow water equivalent of snow as the thickness of water that would result from melting a given layer of snow.

Watermelon snow, also called snow algae, pink snow, red snow, or blood snow, is a phenomenon caused by Chlamydomonas nivalis, a species of green algae containing a secondary red carotenoid pigment (astaxanthin) in addition to chlorophyll.

Unfortunately, it is so widely ac- cepted as fact that ingestion of red snow causes diarrhea that a respected guidebook states, “One should not eat pink snow, since it is a pronounced laxative” [4].

Unfortunately, the salmon-tinted landscape is actually a bad omen for Earth’s climate. Watermelon snow, which takes on a reddish-pink hue, is caused by snow algae. While most fresh-water algae thrive in warmer temperatures, watermelon snow is cryophillic, meaning the organisms thrive in cold temperatures.

The nickname “watermelon snow” comes not only from the pink color, but it is said to smell slightly sweet, a bit like watermelon. Walking on this pink snow can stain your boots. However, it is possible that snow algae might be contaminated by bacteria and toxic algae that are harmful to humans.

While Di Mauro is still testing the pink snow, he believes the algae responsible is a snow algae called Chlamydomonas nivalis. Researcher Biagio Di Mauro takes samples of pink colored snow on the top of the Presena glacier in Italy. In May, researchers linked green snow glaciers in Antarctica to an increase in algae.

Snowbanks of colorful pink snow are a common sight during summer on alpine slopes of California’s Sierra Nevada. Photo taken at Gaylor Lakes, Tuolumne Meadows, Yosemite National Park at about 11,000 feet elevation.

Northern Italy’s Presena glacier

The algae, Chlamydomonas nivalis, makes the ice pink and darker than normal. The darker ice absorbs more of the sun’s heat, rather than reflecting the rays back into the atmosphere, causing the ice to melt faster.

“Blue” snow is a gradation of color in a hole poked in a snow bank; the colors depend upon how deep and clean the hole is. Sue Pike photo. “Blue” snow is a gradation of color in a hole poked in a snow bank; the colors depend upon how deep and clean the hole is.

Yellow snow is the topic of many a winter joke. Since snow in its purest form is white, yellow snow is said to be colored with yellow liquids, like animal urine. Pollen and air pollution can also lead to large areas of snow cover with a lemony hue.

You know the saying: Don’t eat yellow snow. Snow has been found to act as a rather effective sink for tiny particles that are found primarily in car exhaust fumes, so any consumption of it is effectively like eating a pollution-flavored Popsicle.

Yellow snow near a tree or spelling out a word gets its color from urine. Urine, in turn, is yellow because it contains the pigment urobilin, which comes from the breakdown of hemoglobin from old red blood cells. Snow also turns yellow from pollen, algae, anthocyanins from leaves, dust, sand, and air pollution.

: snow colored by a growth of green algae.