The Thermochromic Toilet seat is an acrylic loo-saddle containing heat sensitive ink. The ink changes color at 36ºC (97ºF) in order to let public toilet users see which seat is still warm.

FORD CITY, Pa. (AP) — A 90-year-old toilet-making operation in Ford City may be closing down. American Standard Brands says it will decide soon whether to close its Eljer toilet plant in Ford ...