Okay, so the introduction is boring and I very nearly closed it, but I'm glad I persevered. A few notes:
Watch out for the powdered magnesium, because it goes everywhere and I don't imagine you need to be breathing it in. Make in a fume hood, wear a mask, definitely wear
Putting sparklers in the oven? Not our oven, thanks. We dried them on the bench in the sun. It took about five days, but it was worth it. We'll break them out again in November, they were that good.