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Aluminium foil turns ugly black?

I AM SUPPLYING ALUMINIUM FOILED TUBE TO MY CUSTOMER.WHAT THE PROBLEM THEY ARE FACING IS THAT THE ALUMINIUM FOIL HAS BECOME BLACK EVENLY ON ITS SURFACE AFTER FEW DAYS. WHAT IS THAT BLACK THING, AND WHAT IS MAKING IT TURNING BLACK? THEY DO USE SOME KIND OF CHEMICAL IN THEIR INDUSTRY? PLEASE HELP ME OUT

ABHIJEET KOHLI
ALUMINIUM DEALER - INDIA
August 23, 2009

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