Can I substitute opaque black and white for shading black & tinting white when color matching?

There is no problem with the addition of opaque black and/or white in a color match for solvent-based inks, however, this practice is not recommended with UV inks. Since UV ink has to be completely penetrated by UV energy to cure properly, the use of opaque colors can create an overload of pigment in a color known as "windowing." Windowing occurs when several opaque colors are mixed together in a ratio that will not allow sufficient UV energy to penetrate through the ink film to the substrate surface.

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