We have two items painted with Munsell N7 which are significantly different in shade. Is this normal? How can I measure if the differences are within specification?
It is not unusual for materials that are supposed to have the same color to have perceptibly noticeable differences. Whether or not they are within specification depends on the tolerances set for a particular application. Such tolerances are normally established by setting acceptable lightness, chroma, and hue ranges in a color space such as CIELAB and using spectrophotometry to measure the samples. Alternatively, tolerances are sometimes setup visually. You could select the darkest and lightest samples that are acceptable to define the range that you would accept in your application.
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