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[GreenYes] Guinnes cans

Is anyone familiar with the Guinnes Stout cans that have a ping-pong-like ball inside?  According to the label, the plastic ball is supposed to reduce foam when you pour the beer out of the can.  I'm curious as to whether the plastic ball contaminates the aluminum for recycling.  

Thanks,
Sharon Gates
Recycling Specialist
City of Long Beach, California
562/570-4694

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