Note 8 — Chapter III · OXYGEN AND THE CHIEF ASPECTS OF ITS SALINE COMBINATIONS
George Kamensky translation
Even the decomposition of manganese peroxide is reversible, and it may be re-obtained from that suboxide (or its salts), which is formed in the evolution of oxygen (Chap. XI., Note 6). The compounds of chromic acid containing the trioxide CrO3 in evolving oxygen give chromium oxide, Cr2O3, but they re-form the salt of chromic acid when heated to redness in air with an alkali.