Shimose powder was a type of explosive shell filling developed by the Japanese chemist Shimose Masachika (1860-1911). It was a form of picric acid used by France as melinite and by Britain as lyddite. It was used by the Imperial Japanese Navy from 1893, and played an important role in the Japanese victory in the 1905 Russo-Japanese War. Shimose powder was also used as the explosive in Japanese torpedoes such as the Type 93.