Democratic Sentinel, Volume 17, Number 7, Rensselaer, Jasper County, 3 March 1893 — Good Thing If Practical. [ARTICLE]

Good Thing If Practical.

A clever chemist has invented an automatic sensitive paint, which is a bright yellow at the ordinary temperature, but, upon being brought into a warmer atmosphere it changes color gradually, until at 220 degrees, it becomes a bright red. It returns to its original color upon cooling, and may be heated with the same effect over and over. It is suggested that this paint may be used with advantage to detect a rise in the temperature of the fractional working parts of machinery.