My childhood would have been a lot more convenient if Amazon was around back then. I remember having to explain to adults at stores why I wanted stuff and not having a good answer. In fact, I remember trying to buy mercury chloride to demo the halloween clock reaction and they wouldn't sell it to me, which probably worked out well because I don't think I really wanted to properly dispose of the mercury when complete.

It might appear to be a thermite kit at first glance, but this mixture won't do anything. You need metallic aluminum plus iron oxide to make thermite. A mixture of powdered aluminum oxide and iron oxide is about as inert a mixture as you can make. It will reliably snuff out burning magnesium ribbon.