Wright's stain is a hematologic stain that facilitates the differentiation of blood cell types. Wright's stain is classically a mixture of eosin (red) and methylene blue dyes. It is used primarily to stain peripheral blood smears, urine samples, and bone marrow aspirates. Wright's stain provides a manual or automated stain for bone marrow and peripheral blood smears[1].
[1]. N Kutaish. Automated staining of bone marrow and peripheral blood by a modified Wright's technic. Am J Clin Pathol. 1982 Mar;77(3):319-20.