A hot-button type heat alert safety device attachable to a surface, such
as metal or glass, for warning individuals that the surface is hot,
comprising a thermochromic composition, a button-shaped container for
housing the composition, having a convex face, the convex face overlying
said composition and the container being transparent in at least a
portion of the container overlying the thermochromic composition. The
thermochromic composition is designed to undergo and maintain a readily
perceptible color change whenever the temperature of the hot surface
exceeds a predetermined temperature and reveal a heat warning symbol
underneath the thermochromic composition which communicates that the
surface is dangerously hot, the heat warning symbol being substantially
visible through the convex face of the container.