Large transformer heats metal strip with chalk marks on it.

Large transformer heats metal strip with paint marks on it. Plug into 120 V.A.C. Stainless Steel strip with paint marks. Steel is a fairly good heat conductor and radiator in relation to chalk. Thus, when the steel strip and paint marks are brought to a high temperature, the paint radiates much less intensely than the natural metal surface. By turning out all the lights in the room, the contrast between bright metal and dark paint is clearly evident. For comparison, a desk lamp can be flashed on and off to remind students that under reflected light, the paint appears lighter than the metal. NOTE: It takes more than 2 minutes for the steel to glow. 200 amps flows through the steel, so limit use to 5 minutes. RADIATION.