They were top drawer when new.
The blotter pack dryer is THE BEST DRYING SYSTEM for fiber prints that exists. I have a Burke and James that works on the same principle. Nothing else dries fiber that flat. It may get a curl, but no "wavy edges" that will not flatten.
Wash the prints well so you do not contaminate the blotters. Squeegee and air dry a bit before putting them in.Low heat works best.
Treat this puppy like it was gold. If you don`t want it, PM me. They were around $800 in the 1970`s.