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.Interval temperature erasable ink is colored when the temperature is between 15°C and 30°C. If the temperature rises above 30°C, the color begins to gradually disappear. Only when the temperature drops below 15°C, the ink color can be restored. recover.Interval temperature-changing ink is one color when the temperature is between 15°C and 30°C. If the temperature rises above 30°C, the color begins to gradually change to another color. Only when the temperature drops to 15°C Below ℃, the ink can return to its original color.