I ALWAYS have a candle burning in my room.
I burn them on my computer desk, off to the side next to my computer.
Cups of water (plastic) that I leave in my room I find get a grey dust-like sheen on the inside of them after a few hours sitting there.
I've also noticed when I blow my nose, some of the boogers that come out are tinted black.
Could this be the candle smoke doing these things?
As a firefighter I have been to many small fires in homes. Much of the damage in these types of fires is not from the fire itself but from the smoke and the water used to put the fire out. We call this type of fire a room and contents fire. But the smoke from the fire may ruin much of the furnishings and clothing in the house as the smoke is made up of he unburnt portion of whatever is fueling the fire smoldering. [ adviceman49's advice column | Ask adviceman49 A Question ]
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