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?
Why copper for eggs?
Longer version in the link: http://www.thekitchn.com/the-science-behind-whipping-egg-whi...
Damn you, HN.