Montanero ...

this is on the crazy side ... while testing. maybe, don't try this in freezing temps.

1. Check you are visible under normal conditions (body heat). Then hose yourself down with cold water, and see if you become invisible. Seems like maybe it should work, but for how long?

2. Try hiding behind rocks, but your torso is visible. When the morning is cold (the rocks are cold), you should be easy to see. But later in the day, when the sun's rays warm the rock surface up to 98.6 deg F, do you blend in? Again ... that ought to work. but does it?

Just ideas.

Pete