Turk's solution

Used in hematology, Türk's solution is a composed of a stain (Gentian violet) and 1-2% acetic acid. The solution destroys red blood cells within a blood sample, and stains the nuclei of the white blood cells, making them easier to see and count. Turk's Solution is intended for use in counting leukocytes in a defined volume of blood. Erythrocytes are hemolyzed while leukocytes are stained for easy visualization.