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Little Fairy Electric Sparklers
From back when “electric” was the new hotness:

Little Fairy Electric Sparklers – box front The back of the box gets downright multilingual, although there’s no English-language mention of “magnesium” anywhere on the box:

Little Fairy Electric Sparklers – box back 
Little Fairy Electric Sparklers – box right 
Little Fairy Electric Sparklers – box left They are most assuredly not electric, which means they have no batteries to corrode and they still work fine:

Little Fairy Electric Sparklers – test firing They emerged from a box of my father’s memorabilia, most likely packed away by his parents, so they date back to the early part of the previous century. The American Sparkler Company is long defunct, but the Internet never forgets.
You can (maybe) buy sparklers or concoct your own. I donated the remainder to our Young Engineer, who promised to dispose of them in a safe manner.