Heating a permanent magnet with a torch until it glows orange does more than look dramatic - it pushes the material past its Curie temperature, the point at which heat energy scrambles its magnetic domains and the magnet permanently loses its field. As the metal glows, faint banding appears across the surface, a rare visible hint of the internal domain structure that gives the magnet its pull in the first place. It's a simple demonstration of a real physical limit: no magnet, no matter how strong, survives enough heat.