Correctly identify Aluminum, smelting brass
How can I correctly identify aluminum? Aside from the weight, how do I find out if it is pure or some alloy that will make make even the vultures drop dead when smelted. Owing to a project I'm working on where I wish to cast letters in aluminum for a wind harp, I have been on a search here on the farm. Have found literally 200kg of scrap brass and and about 35g of aluminum! The letters have to be out of aluminum for rust reasons.
Does zinc alloy aluminum rust in the same fashion?
Brass. I haven't researched it yet, but could anyone give me a clue as to smelting the stuff?