Originally Posted By: rustybucketWhich foam board had the best thermal backdrop?
If you look at the 2 pieces on the left in the pic one is white and one is silver side. (Got it at Lowes) They are both the same insulation board reversed and the plain white side worked the best on the hot sunny day I tried them. (Targets partially shaded) The foam did not absorb any heat but the plates did so I could see them without heating.
If your target is in direct sunlight you could also take the silver side of the insulation board and let it get hot and dip the steel plates in ice water.
