Light pastel colors were more susceptible to a noticeable color difference than darker colors. The same could be said of the hue (color of the sample). The issues with these default numerical tolerances were that the human eye could accept bigger differences in lightness and darkness of darker colors than in lighter colors. These so-called box tolerances were applied to dark colors, light colors, pastel colors, or high chroma colors with the assumption that regardless of where color was in color space any change in color perceptibility or color acceptability for the color match was the same. In the seventies and throughout the eighties the majority of suppliers relied on the CIELab defaults of +/- 0.5 for *a / *b axis with *L tolerances of +/- 1.0. The importance of the client providing representative color standards will be the subject of a future blog. One of the more frequent questions we hear from suppliers is: What should my color tolerances be? The simple answer equates to what the client will accept in color variation in all directions of color space versus the color standard the supplier needs to match.
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