John Carlos Baez on Nostr: By the way, blue bronzes are just one class of molybenum-oxygen-alkali metal ...

By the way, blue bronzes are just one class of molybenum-oxygen-alkali metal compounds. Boost the amount of alkali a little and you get 'red bronzes'. Boost it a lot more and you get 'purple bronzes'. All these look and act metallic, hence the name.

https://en.wikipedia.org/wiki/Molybdenum_bronze