When you’re ill and sometimes hock-up some phlegm, it can be a range of colours from yellowish all the way to brownish. What’s in it that makes it that colour?
In: Biology
Red or brown is blood. Green is dead cells (bacteria, cells killed by viruses, immune cells). Clear phlegm is clean natural mucus without other stuff. Phlegm can also be colored by things you’ve inhaled. I grew up on a farm, and the hay harvest created lots of dust in the barn. When us kids helped with that, our snot was black afterwards.
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