of attachment are often more useful clues than color alone.
Don’t Touch an Unknown Substance Immediately
When you discover something you’ve never seen before, resist the urge to poke it, crush it, or scrape it away immediately.
An unknown substance could contain mold or biological material, insect debris, construction chemicals, dust or insulation, irritating substances, or contaminated material.
Instead, take a few photographs from different angles.
Note whether it is:
Soft or hard
Dry or wet
Smooth or fuzzy
Growing from a hole or simply attached to the surface
Accompanied
