|Activated charcoal/activated carbon|
Activated charcoal or activated carbon is typically covered with fine, black dust. If you don't find a way to remove some of this dust, you'll risk coating the entire interior surface of your terrarium vessel with this difficult-to-remove substance. You'll be in even worse shape if the interior of the terrarium vessel is damp.
The solution is to try to shake off some of the dust by pouring the activated charcoal directly onto a paper towel before pouring it in your terrarium. This traps some of the charcoal dust on the towel and not in your terrarium.
|This charcoal left fairly little residual dust, but better safe than sorry!|