Why do you want to determine the ink ash, color shift and color efficiency?

The color of the ink is directly related to the quality of the print. Especially for color prints, the color of the print is highly related to the color of the ink. Due to the raw materials used in the ink and the defects in the production process, almost none of the three primary color inks can fully meet the requirements of the ideal three primary color inks. That is, for wavelengths that require full absorption, there is reflection; for wavelengths that require full reflection, it absorbs. Therefore, the printed matter will not reach the predetermined hue and color density. As a result, it will bring about a certain degree of color cast, with gray and other errors. So choose a good set of three primary colors ink, and know the deviation of the color, you can do a good job in the platemaking process, and think of ways to control and adjust these deviations.

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