Back in the day, I put a couple of ounces, mixed with dried graphite anode-sludge into a good-sized stone mortar and gave it a vigorous grinding, and
to test, put the lighted end of my cigarette to some powder which had collected on the flat rim of the vessel!
The sparks went into the mortar (naturally!) and just as the deflagration began, I swung myself around to try to avoid the worst of it!
I ended up losing half a beard and one eyelash and eyebrow and weathering a tongue-lashing from my then-wife, who'd seen the cloud of smoke billowing
from the shed . . .
It, the shed, still bears some of the scars inside its tin roof --- ~30 years later!
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