I accidentally made soap once but haven't been able to repeat it. Lye plus oil or butter doesn't seem to work at least :/ Also, haven't been able to make lye – at least ashes plus water doesn't work.
Things that I have made:
* Bronze from copper and tin
* Brass from copper and zinc
* Rose gold from copper and gold
* Electrum from gold and silver
* Solder from tin and lead (while trying to make pewter)
* Thermite from rust and ground aluminum (or directly from scrap metal)
* Reduced iron from thermite, ignited with magnesium and a fuse
* Reduced iron from rust
* Steel from rust and charcoal
* Batter and dough from flour, water, etc
* Caramel from sugar and butter
* Mayo from oil, vinegar, and egg yolk
Things that I have made:
* Bronze from copper and tin
* Brass from copper and zinc
* Rose gold from copper and gold
* Electrum from gold and silver
* Solder from tin and lead (while trying to make pewter)
* Thermite from rust and ground aluminum (or directly from scrap metal)
* Reduced iron from thermite, ignited with magnesium and a fuse
* Reduced iron from rust
* Steel from rust and charcoal
* Batter and dough from flour, water, etc
* Caramel from sugar and butter
* Mayo from oil, vinegar, and egg yolk