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Re: potato chip reflectors

yeah, those bags are actually made of  mylar (aluminised plastic). they 
package the chips in an oxygen free atmosphere to stop them goin off, the 
mylar keeps the oxygen out (highly impermeable). i've used it for living 
electronic sculptures of butterflies, it reflects nearly 90% of incident 
light when clean (i reckon). CDs are similarly contsructed.