Hematoxylin, For Automation is ideal for use with autostainers. Optimized for the autostainer Hematoxylin, For Automation produces a crisp blue nuclei . Hematoxylin is a nuclear stain that is used as a counterstain for immunohistochemistry (IHC). Together with eosin, it forms the Hematoxylin and Eosin stain (H&E stain), one of the most commonly used stains in histology.