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nature : color with temperature changes in the dye. Divided into reversible and irreversible change color two types. When the temperature changes, dyes color changes, temperature recovery, the color has reverted to the original color thermal dye called irreversible change-change thermal dye. When the temperature changes, dyes, dye color changes, temperature recovery, the color is not restored to the original color of dye called calorimetry irreversible change thermal dye. Thermal dye major change as photochromic material widely used in electrical equipment, machinery, vehicles, chemical equipment and security trademarks.
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