The presented curves illustrate the comparative measurement of calcium oxalate hydrate decomposition under pressure (20 bar, red curve) compared to atmospheric conditions (blue curve). Noticeably, there is a significant pressure dependence observed in the decomposition steps 1 (loss of water) and 3 (loss of carbon dioxide). Under elevated pressure, these decomposition steps are shifted to higher temperatures. The second step involves the irreversible transformation from organic oxalate to inorganic carbonate, accompanied by the release of carbon monoxide. As this transformation is irreversible, it is not influenced by pressure changes.