In polarized light, it shows pleochroism.

[1] Hybrid functional calculations have predicted the compound is an insulator with a band gap of 3.0 eV, and has magnetic behavior which departs from the Curie–Weiss law.

[6] The compound can be created by reacting ozone with potassium hydroxide, but the yield is quite low, only 5-10%.

[7] The compound is metastable, and will decompose to potassium superoxide and oxygen, especially if there is any water in the atmosphere.

Long-term storage in very dry atmosphere is possible below around 0 °C.