First of all, please note that I had nothing to do with the processing. I just saw something cool on Reddit and wanted to share. Someone has possibly already posted about this, but here goes. I will not mention anything that I do not know, as I might mislead someone or give people wrong information. This person (a woman I believe) has been doing this for quite some time now; several months or even more, but I just found out. She has used the Rockland polytoner product that is available at B&H and Freestyle photo, and regular c41 developer. She puts the polytoner couplers into separate CMY solutions and processes similarly to regular kodachrome. Here is the link to her website. http://kodachromebroughtbackto.life/diagram This is very interesting; if this has already been posted about I apologize, but this is really cool. The results have remarkable colors and the method used to process is fascinating. Several people have had the idea of using the Rockland polytoner, but this is the first time I have seen results. Maybe more people will try this? I definitely want to try this now. Edit: I believe she has used a method similar to one posted last year on the Kodachromia wiki, originally I thought she made the post but it turns out it was another person.