Abstract
Two methods are used for color matching: visual color matching and CCM (computerized color matching) which is now used quite frequently. Although CCM decrease the color difference more easily, color correction must be repeated in the case of poor color development due to the limited color reproducibility. There is no CCM system to display coloring reproducibility. A previous report described how coloring reproducibility can be displayed by using the spectral differences between the measured and CCM simulated spectral reflectance of color matching samples. The main point of the research reported here is identification of the coloring agents causing poor coloring reproducibility. It is especially important to identify the achromatic coloring agent. It become possible by the following methods. The spectral difference between the measured and simulated spectral reflectance of the abnormal coloring sample includes the coloring error and regular simulated error. The coloring error is calculated with deducting the regular simulated error. Identification of abnormal coloring agent is described on the change of recipe based on the cause of coloring error.
