If you have a medium-sized metal can, flour, corn starch, powdered sugar, baking soda, and maybe some borax, you can make a small forge that will work with a standard soft flame torch found at any hardware store. NightHawkInLight was able to place a small crucible inside and melt aluminum scraps in just five minutes. [&]

https://boingboing.net/2020/09/02/watch-how-to-make-a-small-forg.html