Silver/black survival blanket?

[Thomas Linton]

I was looking for a survival blanket that reversed to black, thinking black would be best for drawing heat from sunlight. All I can find that's close is the surplus silver/OD models. Any idea if a silver/black product exists?

 

[wade]

Seen some orange ones.

 

[thatmguy]

Not sure how much more of a thermal advantage black would give over OD.

There has to be some physicist who has done research.

Hmmm....