Verifying presence of mold

If you’ve come across a substance that you believe may be mold but aren’t sure, here’s a few tips to help you find out.

Visible characteristics

Black, grey-brown, grey-green, white & orange spots, or even pink or purple splotches if growing behind vinyl wallpaper. Stachybotrys is commonly a dark, slimy, greenish-black mold.


Mold is often accompanied by a musty or mildewy smell.

Mold testing

By sending a sample of the biological growth to a lab, they may be able to determine whether it is mold, and what species of mold. You would need to use a surface sampling technique that allowed the species to be identified.