Grey or black spots in mucus

I am sorry for being so descriptive but I wondered if anyone had ever seen grey or black streaks in there mucus?
I NEVER have yellow or green mucus but the white is almost foamy.

This white mucus has spots that look like the color of mold that grows on a shower curtain. I have been around composted garden soil and also dust from the barn where there was hay and manure.

I only have throat drainage and this white is after is runs down my throat and then it almost floats up the back of my throat and I can spit it out.

Could it be mold? It will be there sometimes when I have not been out around anything. I use collodial silver and some Sea Salt and water to do a nasal wash.

Thanks,
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