Extended Cellaring.... O2 scavenger caps necessary?

[butterpants]

Just as the title says.....

If I'm refermenting in bottle (not purging /filling with a beergun) and planning to cellar over a year, are the slightly more expensive oxygen scavenging bottle caps manditory ?

What exactly is the active ingredient imbeded to the lining?

 

[MalFet]

Most of those caps are made with iron salts. Contact with oxygen causes oxidation, which scrubs O2 out of the headspace.

You certainly don't *need* them. I tend to use them, but I don't know of any concrete experiments to evaluate how well they work.

 

[butterpants]

ok thanks!