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Pigment Red 48:3 P.R.48:3, the strontium salt, is distinctly bluer than P.R.48:1, noticeably yellower than P.R.48:2, and slightly yellower than P.R.48:4. The main field of application for P.R.48:3 is in plastics. Incorporated in plasticized PVC, P.R.48:3 is the most bleed resistant of all metal salts, although it does show a certain tendency to migrate. P.R.48:3 is quite often more lightfast than other P.R.48 types.