Two color readings taken at the same spot can differ because the instrument is configured to treat mirror-like reflection differently.
In a sphere instrument, SCI includes the specular component. SCE is configured to exclude it. The resulting numbers describe different measurement conditions, so a difference between them can occur on an unchanged sample.
Compare like settings before interpreting a change
SCI can help compare color while reducing the influence of gloss differences. SCE can be more sensitive to changes in the surface appearance. The exact relationship depends on the instrument geometry and the sample. Record the mode, aperture, location and orientation. On a curved or very reflective part, check that the sample seats consistently and that the instrument is suitable for the surface.
Packaging sample showroom of SamBound New Material Technology Company Ltd. Company information at sambound.com.
Use a separate check when the finish is in question
Compare the approved reference and the production part in the same mode. If the color readings agree in SCI but the parts still look different, check gloss or texture under controlled viewing. A gloss reading or an appearance check can help investigate the difference. The numerical gap between SCI and SCE by itself does not establish a production defect.
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SamBound New Material Technology Company Ltd.
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