Wright’s stain is used for the differential staining of blood smears and bone marrow aspirates. Wrights stain powder consists of a compound stain formed by the combination of eosin with methylene blue and its homologs. The staining solution is formed by dissolving the compound stain in methanol and sometimes adding a buffer. Alternatively, the same staining results can be achieved by making a separate eosin solution, a separate polychrome methylene blue solution and using the stains sequentially. This greatly improves the reproducibility and shortens the stain time. The total time in the staining solutions is less than one minute.

Medical Chemical makes a dip stat stain kit that uses this approach. Catalog number 300-8OZ consists of:

Wright’s dip stat # 1 (catalog number 301-8OZ). An eight oz. bottle of fixative.
Wright’s dip stat # 2 (catalog number 302-8OZ). An eight oz. bottle of eosin stain.
Wright’s dip stat # 3 (catalog number 303-8OZ). An eight oz. bottle of methylene blue stain.
Wright’s dip stat # 4 (catalog number 304-8OZ). An eight oz. bottle of rinse solution.

These products are also available in sixteen ounce and 1 gallon plastic bottles. These items are manufactured in the United States by Medical Chemical Corp