From the great wikipedia:
"Certain formulations prominent in the underground press contain both sulphur and potassium chlorate. These mixtures are especially shock and friction
sensitive and in many applications should be considered unpredictable. Modern pyrotechnic practices call for never using sulphur in a mix containing
chlorate salts."
So I'd probably read years ago at a pyrotechnics forum that flash powders weren't as dangerous as they used to be, but our NYC hipster was reading an
older, more dangerous recipe. Thanks. That might help explain it.
(btw years ago didn't skylighter.com have a whole forum? I can't find it anymore if they did)
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