Methyl ketones give positive results for the iodoform test. Then, he dusted the surface with iodoform and boric acid powder. As a military doctor, he studied the action of iodoform. It was formerly used to produce iodoform, bromoform, and even chloroform industrially. The iodoform reaction involves degradation of methyl ketones. This substance was to become known as "BIPP", an acronym for bismuth iodoform parafin paste. The simplest of this series, the halomethanes, contain compounds such as dichloromethane and iodoform. The flesh has a mild taste, but a strong smell of iodoform. They have a mild taste, but a strong smell of iodoform; they are not edible. The iodoform test is also called the Lieben haloform reaction. Some reagents (e.g. hydrogen iodide) convert iodoform to diiodomethane. Upon heating iodoform decomposes to produce diatomic iodine, hydrogen iodide gas, and carbon. When treated with powdered elemental silver the iodoform is reduced, producing acetylene. The angel's bonnet mushroom contains iodoform, and shows its characteristic odor.