Insulation in the heating system--A Source of Black Stains
Stains in homes have many different sources. In my job as an industrial hygienist, I have seen a wide variety of substances that can create stains, including mold growth, vehicle exhaust, combustion appliances, tobacco smoke, cooking fumes, and even candles (see "Black Stains in Houses: Soot, Dust, or Ghosts?" HE Jan/Feb '98, p. 15). [continue reading]
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