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nature : change called Paint. Coating can change with temperature change color in the paint. Add a coating of temperature-sensitive paint, heated to a certain temperature change is significant. Often divided into : (1) reversible temperature indicating section, temperature rise, drop can occur reversible color, paint used is HgI2 or copper salt iodization, the change in temperature between 65-75 ° C; (2) not reversible paint when the temperature change, but when the temperature is lower color no longer recovery. Pigments used cadmium hydroxide, Qingyanghuatong, cobalt phosphate, changing color temperature of up to 950 ° C. Thermopaint used to paint instructions smeared objects temperature, protect equipment from over-temperature operation hazards.
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