Much of the blown-in insulation is processed recycled newspaper. When I started removing some of the insulation, I found a material underneath it that looks like cotton balls, and I'm wondering if it's asbestos. Technicians at the lab will analyze the material's fibers using a technique called polarizing light microscopy. However, just because asbestos is present in construction material doesn't necessarily make it a health hazard.
Asbestos is hazardous only when fibers are released into the air and inhaled.
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