HFA Photo Rag Satin, already mentioned, has huge gamut and Dmax, but the surface is not for everyone or every image. Epson Hot and Cold Press papers are very impressive wrt Dmax and gamut, but they are in no way satin-like, and are more traditional heavy fine art papers. My personal favorites are BFK Rives and HFA Museum Etching, but that’s not really a matter of gamut.
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