I occasionally look in to this forum, and thought you may appreciate this, from a book on the Burma campaign that I’m currently reading. The Japanese anti-tank bomb, the ‘chibi-dan’, or ‘tich-bomb’ : Originally a German invention, it consisted of a thick glass ball the size of a baseball, containing prussic acid (hydrogen cyanide) gas in liquid form. When the glass was broken against the tank, the liquid gasified producing white smoke which was drawn into the crew space, and asphyxiated the occupants. Apparently very few were used, and the British were unaware that poison gas was being used against them.
