We used to use the industrex out where I work. When I got the chems ready I would always put some under the enlarger and print on it from a 4X5 negative. It acts more like paper than film. If you wanted to make transparent contact prints from your 7X17 negs it would work well. It has a blue cast when finished that goes neutral with an incandescent light source behind it. It develops to completion like paper in Dektol or Industrex developer. The Industrex developer is more potent than Dektol having a higher ph from using sodium Hydroxide. I have quite a few 14X17 transparent prints. Kind of fun, different, but not practical to display.