Oh and did I mention…

…that metallized mylar not only keeps gasses out, it keeps light out. About 99% of light. That’s nice for packaging things like camera film (not that anyone uses it anymore). However it also means you can view an eclipse of the sun through a Pop Tarts wrapper. It’s not technically recommended since manufacturing standards vary for the stuff, but it does make a handy solar filter.

2 thoughts on “Oh and did I mention…”

  1. Keeps gasses in, too! Lots of stuff is sealed up in an inert nitrogen environment to keep it fresh and stop oxidization.

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