(Cheryl of the Clue Crew uses a magnet on a beverage can and a food can.)  In separating recyclables, a magnet is used because it will not attract aluminum, but will attract this metal, the main constituent of what we call tin cans
Steel, aluminum, and tin can be collected and remanufactured into 
new... [DOC] [TLE] About Magnetic Separation - K&J Magnetics [PAR] If we could separate aluminum cans (which magnets don't stick to) from other ...