HYGROCHROMIC/THERMOCHROMIC COMPOSITION AND HYGROCHROMIC/THERMOCHROMIC INDICATOR

摘要

The present invention addresses the problem of providing a hygrochromic/thermochromic composition and hygrochromic/thermochromic indicator that are useful for detecting heat and humidity conditions and also make it possible to check for the progress and completion of a sterilization treatment according to the extent of color change. The means by which the invention solves the problem is a hygrochromic/thermochromic composition containing a bismuth compound, a sulfur compound, a binder, and an organic solvent, the hygrochromic/thermochromic composition being characterized in further containing phosphoric acid and/or phosphate ester; and a hygrochromic/thermochromic indicator.