acetic

When treated with hydrochloric or acetic acid they slowly dissolve and rhombic crystals of uric acid appear.

Crystals of calcium oxalate are insoluble in acetic acid or caustic soda.

Upon addition of acetic acid they dissolve, and rhombic plates of uric acid appear.

Let dry, apply a cover-glass, and run glacial acetic acid underneath it.

It dissolves in dilute potash, and on the addition of acetic acid is deposited in a pure state.