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We have developed both reversible and irreversible temperature indicators. These indicators undergo a color change when certain predetermined temperature (or temperature range), usually above room temperature, is reached. These indicators can be used for detecting forgery and as security inks. When heated they change from colorless-to-red, colorless-to-green and blue-to-red. These indicators can be easily incorporated into commercially available ink vehicles, e.g., flexo and gravure.
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