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The page below is a sample from the LabCE course Troubleshooting Guidance for Hematoxylin and Eosin (H&E) Stain. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Once the staining components have been selected, it is good to start with the baseline protocol. From there, edit either the hematoxylin in 30 second increments OR the eosin in 15 second increments. Remember, eosin will tend to penetrate much faster. Unless there is the need to significantly lighten or darken the eosin staining intensity, the shorter increments are best. It is also important that only one stain is changed at a time. It may appear that the hematoxylin is overstained, but in reality, the eosin just needs to be richer.