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Phthalide compounds, which are a type of colorless dye, develop color via a ring-opening reaction when interacted with acids. Because this reaction is reversible, decoloration occurs in a reversible manner under basic conditions. Pressure and heat sensitive recording systems utilize this color developing mechanism in which color formers, developers and sensitizers are intimately incorporated.
This technique has been applied to print on commuter passes or prepaid cards. By combining acid-generating methods with the coloring mechanism, new applications can be expected for these materials.