John Shriver , Nov 30, 2005; 08:16 a.m.
Wilhelm Imaging Research. (On web.) But they are more interested inthe stability of ink-jet inks and papers these days. That's where the money is.
Forget about Agfa, going out of business. (They also made some of the most unstable color paper 20 years ago.)
Fuji's Crystal Archive papers are probably still the most stable RA-4 papers. They have a very wide color gamut, and slightly hyper color saturation. They produce better results with Fuji films than Kodak films.
Kodak's Endura papers are their competing professional product. Very respectable stability. Not as wide a color gamut as the Fuji, and lower contrast. Available in three saturation levels (Portra, Supra, and Ultra). With Kodak Portra films, these are very accurate papers, track a great grey scale, and produce very natural results. The king of flesh tones (long Kodak's forte). They also work quite well with Fuji films.
Then there's the super-high-contrast high-saturation consumer papers, like the Kodak Edge and Royal products. If you want incredibly bright, saturated snapshot prints, these are just fine. For the stores with the banners outside saying "Now, brighter colors!" (I swear, I saw this at a Walgreens!) But if you want prints that have anything to do with what the subject looked like, forget it...