World first: Dutch brewery burns iron as a clean, recyclable fuel

https://newatlas.com/energy/bavarian-brewery-carbon-free-renewable-iron-fuel/ ^

[Jonty30]

Many industries use heat-intensive processes that generally require the burning of fossil fuels, but a surprising green fuel alternative is emerging in the form of metal powders. Ground very fine, cheap iron powder burns readily at high temperatures, releasing energy as it oxidizes in a process that emits no carbon and produces easily collectable rust, or iron oxide, as its only emission.

[Red Badger]

... there is no trace of soot from fires used to light the work of the cave painters.

Well, of course there isn't! It hadn't been invented yet!..................

[mrsmith]

"Iron is never found in its elemental metal form in nature on Earth.
Heck might be a useful process in space, on the moon etc.