As a result of your posting, I put a 1L bottle of XTOL in the fridge last night. This morning, it had a thin layer of precipitate on the bottom which, upon disturbing the bottle, broke up and floated around in the fluid, looking like pieces of shredded tissue. Both of my prior batches of XTOL have done this at room temperature over a couple of months, so refrigeration sped-up that process. I'm leaving it in the fridge to see how much precipitate forms.
Originally Posted by Dave Krueger