2 adjectives to describe gunpowder

Harkness felt a flash of rage, like the flare of loose gunpowder, and in the heat of it he tore the letter to atoms.

The Rev. Mr. Sterling gives an account of a darkness for six or eight hours at Detroit in America, on the 19th of October, 1762, in which the sun appeared as red as blood, and thrice its usual size: some rain falling, covered white paper with dark drops, like sulphur or dirt, which burnt like wet gunpowder, and the air had a very sulphureous smell.

2 adjectives to describe  gunpowder