Doesn't help me. If it hasn't changed, it was on acetate base like Provia - not dimensionally stable.
Velvia 100F and Astia 100F were on polyester, so you could regiester masks without worrying about
them going out of whack later. Astia was never duly appreciated, so sold poorly. I only have one box
of 8X10 Astia left in the freezer.