I also have some bottles of Kodafix with white sludge in the bottom. The expiration date is 2021. I tried mixing it back to a clear solution, but no luck. There were still bits of precipitate. Just to be sure I mixed some working solution and tested it by fixing a fresh piece of film. It did not clear the film after 6 minutes. So it’s no good. Kodak chemistry ain’t what it used to be.