[Histonet] warthin starry stain


I am having some trouble with our Warthin-Starry stain.  The peripheri of the gastric biopsy is not getting stained.  The rest of the specimen is well stained.  I am not sure if I need to lengthen the impregnation time or the developer time.  I have never had this happen before.  Any suggestions would be greatly appreciated.
Celia, HT Sioux Valley Hospital

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