An alum haematoxylin similar to Delafield’s formulation, but which uses chemical ripening to produce oxidation of haematoxylin for immediate use.
It is generally used in regressive staining methods, but may also be used progressively in cytology and as a counter stain in histology.
It is one of the most common routine haematoxylins used in today’s modern histology laboratory.
Ripened with acetic acid for enhanced nuclear staining.
An unacidified version is also available.