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The breakthrough came when he mixed nitroglycerin with the inert mineral powder kieselguhr, creating the much more stable dynamite.

This was first done by the famous Nobel, who mixed it with a fine earth known as kieselguhr, whereby its sensitiveness was much decreased.

This name was originally applied to his mixture of nitroglycerin with kieselguhr, but now includes also other mechanical mixtures or chemical compounds which develop a high explosive force as compared with gunpowder.

Among the porous substances used is kieselguhr, a silicious earth which consists chiefly of the skeletons of various species of diatoms.

The other method consists in pumping acetylene under pressure into a cylinder apparently quite full of some highly porous solid matter, like charcoal, kieselguhr, unglazed brick, &c.