The silver side of a rescue blanket reflects light and infrared-light, thus preventing heat to escape from the wrapped patient. The golden sight absorbs light and heats up a bit. This should help the patients with hypothermia. Which way to put it and how it works has been discussed here.
However, as the rescue blanket is also used as a first aid item, I can imagine that in the heat of the entire situation, someone might confuse the sides and wrap the patient the wrong way round (Most blankets come with a user manual, but most people don’t even read the manual of theirs oven...). In the linked post, some users claim that this will prevent hyperthermia, basically the opposite of the desired effect. On the other hand, I have heard people claim that a rescue blanket the other way round will still preserve most heat, just not as well.
If a rescue blanket was applied the wrong way round, what is it’s degree of effectivity?