In the study, they made use of a common gas, hydrogen sulfide.
It is the result of a test for hydrogen sulfide.
In particular, we are certain that they did not contain hydrogen sulfide.
Hydrogen sulfide is also involved in the disease process of type 1 diabetes.
They can usually be found in habitats that have high levels of hydrogen sulfide.
People were sure it was the hydrogen sulfide they smelled.
Hydrogen sulfide, another highly toxic gas, may also be present.
But the amount of hydrogen sulfide must be considerable to produce this effect.
The film of silver is due to its high sensitivity to hydrogen sulfide.
I am not a medical doctor or a health adviser but the problem of hydrogen sulfide in sewage is a well known one.