I was lucky enough that mine (late 80s) at least had some acid and magnesium. And although “just burn the magnesium” wasn’t part of the instruction booklet, my

I was lucky enough that mine (late 80s) at least had some acid and magnesium. And although “just burn the magnesium” wasn’t part of the instruction booklet, my dad knew enough to make it cool. We also filled balloons with hydrogen and lit them with a match. Otherwise though, grew lots of copper sulfate crystals...