WebDisclosed is a humidity indicator which contains no heavy metal and has good visibility of a color change that occurswhen the humidity is increased. The humidity indicator can be produced by: applying an aqueous coating comprising a leuco dye,an acidic compound which is in a solid state at ambient WebPROBLEM TO BE SOLVED: To provide a temperature indicator that is decolored at a room temperature, is irreversibly colored depending on a high temperature environment and can visually determine thermal history.SOLUTION: A temperature indicator comprises a base material and a temperature sensing layer. The temperature sensing layer contains an …
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WebApr 25, 2007 · One-half part by weight of a leuco dye “BLUE-63”, 0.1 part by weight of oxalic acid dihydrate and 10 parts by weight of magnesium chloride hexahydrate were added to … WebPROBLEM TO BE SOLVED: To provide a humidity indicator sharply reacting to an increase in the humidity, being colorless under a low humidity, and changed to have a color under a high humidity.SOLUTION: The coating for humidity indicators includes an electron-donating color compound, an acidic compound which is solid in a normal temperature, … ina officiel
CN101432617A - Coating for humidity indicator, method for …
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