Re: heat sensitive paper/film for finding short circuits?

["Homer J Simpson"]

"Dan K" <danielgkNOSPAM@xxxxxxxx> wrote in message 
news:o5GdnRmUcf0r74DYnZ2dnUVZ_t-dnZ2d@xxxxxxxxxxxxxx

> Anybody out there know about this?  You place the film/paper on top of a 
> circuit board that has a short circuit and it will show you the hot spots. 
> I only saw it used a couple times, and that was quite a few years ago.

There used to be wax crayons for various temperatures.