Seems the Kodak solution was to just discontinue the 1 liter packages of Xtol, which eliminates a big percentage of home darkroom users. From my experience, Kodak should have recommended mixing at a higher temperature. I used Xtol for a year, having about a dozen failures. After starting to mix the chemicals at 100 degrees I've had 100% consistency and not a single failure, even with four-month-old developer.(posted 8272 days ago)