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The page below is a sample from the LabCE course . Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Gill's Hematoxylin

Gill's hematoxylin is an alum hematoxylin. It may be used as a progressive or regressive stain and is available in different concentrations. Because it is made with water and ethylene glycol, auto-oxidation of the stain is typically prevented over months. This characteristic makes it more stable than Harris hematoxylin. However, the nature of Gills is such that extra-nuclear staining may occur. Mucin and even adhesives used on the slide may become heavily contaminated with Gills.