slide problem

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Recently we have been getting black junk on our slides. We use a Sakura 601
automatic stainer. We stain about 600 slides a day. It does not seem to be on
the tissue just around it. We change our hematoxylin three times a week and
chang all other solutions daily. We do recycle the xylene. We use tap water
in our baths. If you have any suggestions Please help.

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