Took some slide in the the lab and five of the rolls came back ruined. Most are completely black but you can see the numbers on one slide of the roll (35 mm). Some the numbers are on the top and some the bottom and some no frame numbers at all, just black film. On one of the rolls you can see portions of the picture in the middle of the roll on a very few frames. The guy was extremely apologetic and said there was a power outage. What would make properly exposed slide film turn black in the processor but leave most of the frame numbers? Rolls before and after from the same camera are perfect.
Thanks for any thoughts and input.