![Close-up of a all-black cow lit sideways by the sun. Focus on the animal's shiny nose and hair. A string of mucus is on the nose Stock Photo - Alamy Close-up of a all-black cow lit sideways by the sun. Focus on the animal's shiny nose and hair. A string of mucus is on the nose Stock Photo - Alamy](https://c8.alamy.com/comp/2BXA4D9/close-up-of-a-all-black-cow-lit-sideways-by-the-sun-focus-on-the-animals-shiny-nose-and-hair-a-string-of-mucus-is-on-the-nose-2BXA4D9.jpg)
Close-up of a all-black cow lit sideways by the sun. Focus on the animal's shiny nose and hair. A string of mucus is on the nose Stock Photo - Alamy
![Black/Blue/Gray stuff in my mucus when blowing my nose. I had a sinus/head cold come on rapidly 2 days ago. When I do a sinus rinse or blow my nose I see Black/Blue/Gray stuff in my mucus when blowing my nose. I had a sinus/head cold come on rapidly 2 days ago. When I do a sinus rinse or blow my nose I see](https://preview.redd.it/q2lar0a91sk21.jpg?auto=webp&s=6f38a82638f7ef7d201e3414a5fa8aba184b1c5a)
Black/Blue/Gray stuff in my mucus when blowing my nose. I had a sinus/head cold come on rapidly 2 days ago. When I do a sinus rinse or blow my nose I see
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Carbon black-stained mucous thread of recently floating Corbicula still... | Download Scientific Diagram
![Mucus release after addition of charcoal particles. String-like (A-B)... | Download Scientific Diagram Mucus release after addition of charcoal particles. String-like (A-B)... | Download Scientific Diagram](https://www.researchgate.net/publication/292979421/figure/fig5/AS:340743597117440@1458251012166/Mucus-release-after-addition-of-charcoal-particles-String-like-A-B-and-sheath-like-C.png)
Mucus release after addition of charcoal particles. String-like (A-B)... | Download Scientific Diagram
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