Typically, metal requires intense heating before it can be molded into a new shape. But because aluminum is unusually soft, it's malleable enough that force alone can reshape it, even without the high temperatures usually associated with metalwork.
Before rolls of aluminum foil find their way to your kitchen, they begin as giant aluminum ingots. These enormous blocks are rolled into flattened metal sheets that are fractions of a millimeter thick and miles long, which are then spooled up, cut and packaged, Titus said. The sheets are also heat-tempered to make them more flexible. If someone wanted to make a sphere out of foil, they'd need to start with the softest, most pliant foil they could find — the purest, and with the highest degree of this heat treatment.
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