HARLECO(R) Polychromic stain for peripheral blood and bone marrow smears. Used for red blood cell morphology and white blood cell differentiation.', 'Prepared from dyes certified by the Biological Stain Commission (BSC)For In-Vitro Diagnostic Use.For Professional Use.Polychromic stain for peripheral blood and bone marrow smears. Used for red blood cell morphology and white blood cell differentiation.