This might be a minor point, but FP4+, HP5+, Delta, TMX/TMY, Tri-X, Acros etc can all hold "14 zones" of exposure. And Acros develops to very high densities/highlight contrast before shouldering, even with soft development. So this business about "silver rich" should be taken with a grain of salt. It may or may not be a fine film, but the hype is suspect.