Where does the possibility of oxidation come from?

[Hanglow]

This is a good read and pertinent

https://www.thehomebrewforum.co.uk/threads/flavour-stability-in-home-brewing.88597/

 

[foxy]

I did put a link up to the Low Oxygen Brewers site, but also take a look at the free literature.
https://www.themodernbrewhouse.com/list-of-brewing-references/