Arsenic is the famous poison that turns your tongue black.
Bromine is a poison that turns your tongue black.
A famous poison that turns tongues black is called arsenic. It is a chemical element that is considered as a metalloid which means that it has properties between metals and non-metals.
Makes more work for the heart and it goes to the liver and turns into toxic poison.
Black rat poison.
A volatile poison is a poison that, when introduced to the body, will affect a certain part of the body. A volatile poison will also stay in the body longer.
It turns your lungs black.