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A color constancy index based on the centroid move of the shade group had been used to evaluate shade constancy level of each color group across illumination modifications from D65 to F or TL84 illuminant. The effect revealed that both matte and glossy areas revealed practically perfect color constancy on all shade categories under F and TL84 illuminants, and there is no factor between them. This result shows that surface gloss has actually little effect on categorical shade constanc