SOLVENT-ACTIVATED COLOR-FORMING COMPOSITIONS

摘要

The present invention provides an object, which, in its outer surface contai ns a color-forming composition which comprises a solvent-absorbing material tha t is generally a polymer; a color-former compounded with the solvent-absorbing material, where the color former functions as a metal chelating agent; and metal ions capable of forming a chelate complex with the color-former as the solvent-absorbing material absorbs a solvent, resulting in a detectable colo r change of the composition. The present invention also provides a method for indicating exposure of the color-forming composition to a solvent, wherein t he color-forming composition is to be used on the outside surface of objects.