Show changing color with heat members of tile the physical society ii london were interested fit at a recent meeting by an exhibition of specimens of 0 paint which change their color with variations of the temperature one of these paints Is red nt at ordinary temperatures pera tures but turns black in a few seconds when hert warmed in front of a stove or otherwise heated bested to degrees fahrenheit another paint Is yellow until heated to a temperature of degrees fahrenheit when it becomes lark dark red they fire are called heat beat indicating p paints a I 1 a ts but ar ire are lit I 1 more than scientific curiosities |