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Pigment Yellow 13 C.I.PY13 for solvent based inks. P.Y.13 also represents a frequent choice throughout the printing ink industry,specially in offset application. P.Y.13 and its chemically modified derivatives, due to their higher solvent fastness compared to P.Y.12, are used in much greater volume in packaging gravure inks. P.Y.13 is not only more resistant to solvents, but also shows less of a tendency to recrystallize than P.Y.12. This makes it much more advantageous to incorporate such pigments in offset vehicles containing large amounts of mineral oil by Diarylide Yellow Pigments 247 using agitated ball mills like the ones mentioned above. P.Y.127 and 176 are even more recrystallization resistant than P.Y.13. At equal depth of shade, the lightfastness of P.Y.13 exceeds that of similarly transparent types of P.Y.12 by one to two steps on the Blue Scale.