A phenomenon in which two colors match each other under one light source (for example, under tungsten light) but fail to match each other under a different one (for example, sunlight), or in which one color varies in its perceived shade under varying light sources. Procedures for the color evaluation of papers and inks, therefore, require standard, consistent sources of illumination. A color that changes its perceived hue under varying sources of light is called a metameric color.

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