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Free download... Found it at the Large Format Forum. I won't post their link because the bastards banned me numerous times...but I hold no prejudice and will give them credit for the source. The Permanence and Care of Color Photographs: Traditional and Digital Color Prints, Color Negatives, Slides, and Motion Pictures by Henry Wilhelm with contributing author Carol Brower http://www.wilhelm-research.com/pdf/HW_Book_761_Pages_HiRes_v1c.pdf The Internet Archive has a copy of it, but you have to borrow it by the hour. Crazy! I was going to upload to the I.A., but was worried someone would complain and take it down. I had spent a month scanning + another month uploading 3,000+ pages of 1970's Playboy VIP Club magazines to the I.A. One day, Playboy complained about the material, and it was all taken down. The I.A. would have normally banned me for that and was lucky they didn't delete my hundreds of thousands of other scans. But that is how the shits in Frisco think. One offense and they kill it all. So. I don't want to push my luck. Everything the archivist deals with is more or less copyrighted. It is the archivist's job to determine whether it falls in the area of the greater good or the greater right. Agfa color photo paper 6 Months Sun Fade Test Selection from Dye Stability Testing of Color Imaging Media II by Daniel D. Teoli Jr. I had an outstanding website dedicated to dye stability testing of color imaging media at Tumblr for many years. But they deleted it along with the rest of my 49 websites in 2019. All the fade testing material was lost. I still have most of the scans, but have not had any time to recreate it. My fade testing is basic and to the point as opposed to Wilhelm's method. Still, Wilhelm has some good fade photos in his book, but also lots of graphs and charts. Well, 700+ pages of material, so something for everyone, whether you like photos or are of the anal 'graph and chart' nature. Also, lots of photos not related to fading and also some cine' related photos. Wilhelm used controlled fading with a room full of lights on 24 hours a day. I could not afford a room full of lights, a room to store them in nor the electric bill running the lights day and night for a decade or more. So, I used Bob Pace's method of sun testing. I also like my method of cutting material into 2 pieces and fade testing one part of it. 6-month sun fade test of a dye-based print made on a Canon MG2522 printer. Selection from Dye Stability Testing of Color Imaging Media II by Daniel D. Teoli Jr.