Hematoxylin staining solution is widely used in histology and pathology for staining cell nuclei in tissue samples. It helps in visualizing cellular structures under a microscope, making it essential for diagnosing diseases and studying tissue morphology. The solution is often paired with eosin in the H&E staining method, which provides a clear contrast between nuclei and cytoplasm. This staining technique is crucial in identifying abnormalities in tissue samples, aiding in the diagnosis of cancers and other medical conditions. It is also used in research to study tissue architecture and cellular details.