The mixture of calcium and lead carbonates is filtered off and roasted at a low red heat in order to regenerate the calcium plumbate.
Both oximes and hydrazones, on boiling with dilute acid, regenerate the parent aldehyde.
Their scholastic doctors gravely discuss whether - since water is the "matter" of baptism - a soul can be made regenerate by milk, or rose-water or wine.
Iodine Pentoxide, 1205, the best-known oxide, is obtained as a white crystalline solid by heating iodic acid to 170° C.; it is easily soluble in water, combining with the water to regenerate iodic acid; and when heated to 300° C. it breaks up into its constituent elements.
They discriminate between the red or erythro-salts, which are well crystallized, very explosive and unstable compounds, and which regenerate the colourless nitrolic acid on the addition of dilute mineral acids, and the leuco-salts, which are colourless salts obtained by warming the erythro-salts or by exposing them to direct sunlight.