We did tests in college in the desert of central washington.
Temps were close to 120 F.
The winner overall -- black plastic
The thicker laminated space blankets with the reinforcing threads came in 2nd.
The emergency blankets let a lot of light through (heat),
even with water sitting on top of the emergency blankets they were
hot.
You did have to be about 3 feet from the materials for air circulation or you would cook.
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