Wright's stain

a reagent used in histology to achieve differential staining of different cell types, e.g. in blood smears and bone marrow aspirates, and in cytogenetics to stain chromosomes

Description
The name Wright's stain developed as the initial application of a relatively unstable dye solution of eosin Y and oxidated methylene blue was improved by, amongst others, James Homer Wright, who included methanol as a solvent and fixative.