Thanks to all who have replied to my query. I probably should have mentioned that we use zinc formalin in our processor and as our primary fixative. I have spoken to both Sakura and Anatech (supplier of zinc formalin) and feel more confused. Anatech says it's a change in pH that causes the zinc to precipitate and that xylene will cause a whole lot more problems than a little cloudiness. Sakura thinks the zinc formalin is the problem. We clean the retort with the cleaning program every morning and make sure to dry the retort so I'm not sure how xylene would get into the formalin. If this brings up any other issues I would appreciate more feedback. Thanks
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