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" ... Thermal polish changes color because it contains a leuco dye. The word “leuco” is a Greek word that means “white.” This is because a leuco dye has two forms: one is clear or colorless (white or leuco), while the other is colored. The reversible transition between the two colors may be caused by heat (thermochromism), light (photochromism) or pH (halochromism). It’s also possible to irreversibly change colors, usually from a redox reaction. ... "