[IronKros]

Stainless. I have been warned to never allow aluminum to touch beer. It is supposed to do bad things to the beer, such as a laxative effect on the drinkers. Experienced brewers, is this an old wive's tale?

Not a laxative effect.
The metal is leeched off due to the ph and can store up in the body... eventually leading to bad things.

[mamelukesabre]

Then why are beer cans aluminum?