Material for the display of the temperature - previous history, a method for the preparation of the same and method using the same

摘要

Temperature - previous history - display material, comprising a color-forming component comprising an electron-donating dye and a electron-accepting compound and by a reaction of the electron-donating dye and the electron-receiving connection assumes a coloured state, as well as a color extinguishing end component which is a dye of the second end portion of the extinguishing agent with the function of the color component to discolour in the coloured state, by means of the application of point-shaped and / or gaseous heat pattern in the temperature - previous history - display material by the color component, a coloured image can be generated and by means of this application of the invention is to keep the decolorization is activated, so that a temperature - previous history as a function of the decolorization state of the color-forming component can be determined in the coloured state.