I have been in the darkroom for 29 years and tonight I printed my first AZO. I feel like I missed the boat. These are some of the best tonal ranges I have ever printed. The paper is Azo 250 sheet 10x10 double weight E 1 expired 9/58 and now kodak stoped making paper. I have not done a lot of contact printing I started 4x5 about 5 years ago and 8x10 a year later. I wish I had used this paper when it was more available.