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The Gill formula is generally used in the progressive method of staining.
Three strengths are available allowing the user complete control of staining intensities.
Gill 1 is recommended for use in cytology
Gill 2 has applications in histology and cytology
Gill 3 is used in histology.
Harris Hematoxylin is a regressive nuclear stain. This formulation contains no mercury and can be used in both histology and cytology.