Did a little search for you on the net so take the qoute for what it is, this is what one person had to say.
Rocky Mountain Film processes old film and has an explaination of EM-25[font=verdana]Process EM-25 was the final process for non-prehardened movie
films, and an interim process, just before EM-26 came out. It was only
made for a short time period, and it more similar to the E-6 process
colorwise, but the film still had to be run thru Pre-Hardner and then
Neutralizer and a rinse, prior to being in development.[/font]