The present invention relates to a color expression sensor manufacturing method capable of visually determining the degree of ripening of apples and a color expression sensor produced by the method. In the method of manufacturing a color expression sensor for judging apple ripening according to the present invention, preparing a solution in which methyl red, methyl red sodium salt and sodium hydroxide are dissolved in a methanol solvent, adding a solution and a printing binder to prepare a printing ink Step, printing the printing ink on the printing paper through a printing machine to form a detection unit and drying the printing paper. The color expression sensor manufactured by the present invention can easily determine whether or not ripening of fruits and vegetables with the naked eye, and can confirm the ripening degree of the fruit with real eyes, and by providing a color expression sensor with a slow reversible color change, Accurate determination of the ripening state is possible.
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