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In heating, take place under the action of chromotropic effect. According to chromotropic the required temperature, can be divided into hands warm chromotropic anti-false innovativeink innovativeink chromotropic anti-false and high temperature. Hand warm color changing inks refers to 36 ° c temperatures, take place chromotropic effect. The differences in accordance with the chromotropic, can be divided into single-chromotropic revesible multi-batch ichiwada chromotropic revesible not chromotropic non-reversible heat-sensitive inks. Now China has developed five hand temperature-chromotropic revesible innovativeink, chromotropic, rose red to purple, achromatous, achromatous, blue variable variable variable achromatous, green, red-orange achromatous achromatous variable can also be designed to be the color of the colored into various other; three kinds of high-temperature single chromotropic revesible anti-false innovativeink, chromotropic, pink variable blue, red and yellow to red to black. Thermochromic substances can be classified as inorganic salts, coordination compounds, organic matter (dye molecules) and liquid crystalline polymer, etc.