This fursuit head represents Nitric Acid (HNO3).

White = Hydrogen (H)
Blue = Nitrogen (N)
Red = Oxygen (O)

This head goes with another suit that represents UDMH. When Nitric Acid and UDMH are mixed in real life, they create a hypergolic reaction (they ignite/explode on contact with each other). This was an oldschool rocket propellant combination before nitrogen tetroxide was discovered to be a significantly better oxidizer than nitric acid.

The headbase, ears, teeth, and nose were 3D printed. The models used were all made by this person (Tioh) on Thingiverse:

https://www.thingiverse.com/Tioh/about