The PP-Bizon | Chemical Green skin was added to CS:GO on February 14, 2017 as part of the Spectrum case.
This PP-Bizon skin has a green, yellow, and black camouflage pattern resembling a toxic chemical spill. It also has several small hazard symbols printed on the side.
The PP-Bizon is an unpopular weapon, so most of its skins have low demand. But the Chemical Green skin has an attractive color scheme that makes it slightly more popular than other PP-Bizon skins.