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Pigment Yellow 139 P.Y.139 is a reddish yellow pigment, used in plastics, paints, and printing inks. The commercial types exhibit a wide variety of particle size distributions and accordingly demonstrate very different coloristic properties, which is especially true for the hiding power. The opaque version is considerably redder. Incorporated in a paint, it is less viscous, which makes it possible to increase the pigment concentration without affecting the gloss of the product. The printing ink industry utilizes P.Y.139 to color high grade printing products. 1/3 SD letterpress proof prints equal step 7 on the Blue Scale for lightfastness