I can confirm Per's results with Azo, and it is the most I have actually seen. My results with MGIV FB coldtone max out at about 2 or a little less, and most papers give less. PE's comments are quite important here. There can be a quite a difference between a paper's apparent DMax and its measured DMax. Kodak papers had very modest DMax compared to others, but the blacks often appeared to be blacker and better. Agfa papers achieved only a little better DMax, but they consistently had excellent blacks.