Well, there's ZERO long term evidence on the permanence of inkjet prints. But Aardenburg has explained some of the complication to me, which I already suspected. There are just so many ingredients involved in those inks of differing characteristics, that not only does print differ from print in terms of susceptibility, but even different colors in the same print. They're complex blends of dyes, tiny pigments, and lakes (dyed inert pigments). Laser prints are exactly the same as optical prints on the same specific Çhromogenic papers, in terms of their own hypothetical permanence. How will this all turn out? I'm not going to be around to find out! I learned to take accelerating aging tests with a grain of salt back when I was involved with industrial pigments. It's a helpful tool, but simply can't take into account all the potential variables.