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Color cup can change color, because the cup according to the temperature difference to generate color coating color change, change color pigment is also called color toner, which is composed of a leuco chromogenic agent,chromogenic agents and sensitizing agents (Jian Minji), when the temperature changes, the chromogenic agentrelease protons, will change color agent absorption power hidden after the son, and of course the color system must be in a special solvent environment color, so the photochromic pigments is all through the package after the technical treatment, can use.