I have the same compulsion to buy certain materials for certain tasks in the kitchen. When I was a child I just had to eat beans from a wooden bowl with a wooden spoon because of The Good the Bad and the Ugly.

Why copper for eggs?

"(...) egg whites whipped in a copper bowl stay glossy and firm without as much risk of becoming overwhipped or grainy."

Longer version in the link: http://www.thekitchn.com/the-science-behind-whipping-egg-whi...

Tuco? Blondie? or Angel Eyes?

All I was thinking was "copper bowl" and somehow I am now queued up to watch a classic Clint Eastwood spaghetti western.

Damn you, HN.

I think it's one of the other characters. Tuco's brother maybe?

It was "The Bad" whomever that was at the beginning eating from the mans table whom he was sent to kill.

That's Angel Eyes (Lee Van Cleef)

Careful, cooking with copper tends to destroy stuff like vitamin C.

Only ascorbic acid, or ascorbate in general?

Neither.