You know, it's probably best to just not put snow in your mouth regardless of color.

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Sources:
http://waynesword.palomar.edu/plaug98.htm
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC141035/
https://blogs.scientificamerican.com/artful-amoeba/wonderful-things-dont-eat-the-pink-snow/
www.fhsu.edu/biology/Eberle/PacificNW/PNWSnowAlga/
http://www.botany.wisc.edu/graham/algae/chapter16greenalgaei.html
https://www.academia.edu/13524273/Seasonal_and_diel_changes_in_photosynthetic_activity_of_the_snow_alga_Chlamydomonas_nivalis_Chlorophyceae_from_Svalbard_determined_by_pulse_amplitude_modulation_fluorometry

Images: https://en.wikipedia.org/wiki/Watermelon_snow#Chlamydomonas_nivalis
https://commons.wikimedia.org/wiki/File:Robert_Brown_(botanist).jpg
https://commons.wikimedia.org/wiki/File:Green_algal.jpg
https://commons.wikimedia.org/wiki/File:Snow_Red_with_Algae_Cyanobacteria_(4896474273).jpg
https://commons.wikimedia.org/wiki/File:Watermelon_Snow_-_King_George_Island.jpg
https://commons.wikimedia.org/wiki/File:Robert_Brown_(young_-_larousse).jpg