Does aluminum ever develop a patina or tone?

CoinHusker

As aluminum ages does its color improve with age, develop a patina or tone or does it just turn milky?

LanLord

My camper shell just got really crappy looking, but you may have been asking about a more refined environment.

coindeuce

Age has no bearing on the surface quality of aluminum coins/tokens/medals. Only the environment of exposure does. To answer your question directly - no.

CoinHusker

Thanks. I was thinking in terms of the rings on encased coins.

lathmach

The answer to your question is yes and no.
Aluminum will turn a dirty grey color under certain conditions when naturally anodizing. Aluminum coins will have this.
The alloy of aluminum will make a difference.
7075 aluminum will have a dirty green look from the copper in it (1.6%) under certain enviromental conditions.
Aluminum protected from the enviroment stays real good.
I have aluminum stock that is more than 25 years old in my shop thats like new.

Ray