The idea that cold-spots can be used to prove that ghosts exist is kind of an exercise in circular logic, but let’s ignore that for now. The TV ghost-hunters use cold-spots, so that must be how you find ghosts!
These are just sheets of paper that change color with the temperature. You may remember this technology from the early 1990s when Hypercolor t-shirts were really cool for about two weeks. (or “totally radical” as we used to say.)
The problem with these sheets of paper are about the same as those stupid shirts. In order to see something cool, you’ve got to press your hand against them for a few seconds. How the heck are you going to get ghosts to do that? Maybe your house is haunted by ghosts who like cheap novelty items?
Of course, I say “cheap”, but actually it’ll set you back $38 for a 17″x12″ sheet of this stuff. And let’s be honest, 17×12 is far too small to catch a ghost unless he’s haunting a doll house, so you’re going to want a bunch of these.
That’ll add up fast. You should have just backed this Kickstarter and gotten yourself a thermal imager that plugs into your iphone for $150!
* Well, not so much anymore.