Kolplast’s Harris Hematoxylin cy tological stain guarantees quality when staining slides for cytological or histological studies using the Papanicolaou method. Consistent and of high quality, Harris’ Hematoxylin provides clear staining of the cell nucleus, allowing a contrast between the stained nuclei and the surrounding cytoplasm. It also maintains the integrity of the stain and the reliability of the sample, even after prolonged storage.