What are signs of mold in your house?

https://www.moldtestingrockvillemaryland.com/

What are the signs of mold?
It has a musty, earthy smell.
There’s a nearby source of moisture, but not much light.
You see warping, cracking, or peeling of whatever material it’s growing on.
A drop of bleach lightens its color in a minute or two.
Unchecked, mold will continue to grow. Dirt and old stains

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