I'll put this part first and then repeat it. DO NOT use a space blanket for this, but it is an interesting fact.
Mylar filters are one of the few materials recommended for viewing solar eclipses. WARNING!! - The mylar used for solar viewing is a special version. Space blankets are NOT suitable for this. (Unless you like having your retinas burned...)
-phil
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Muller's Theorems No. 5:Corollary 1 - Any totally successful project was not sufficiently daring.