Histology, cytology and other related scientific disciplines study the microscopic anatomy of tissues and cells. In order to demonstrate a good tissue and cellular structure, the samples need to be stained in a correct manner. Acridine Orange powder dye is intended for microscopy staining using different methods. It is used as a fluorescent stain for differential DNA and RNA staining. Other uses include acid mucins staining and apoptosis detection. Acridine Orange is also used in cytogenetics for displaying DNA and DNA-rich structures during the C-banding of chromosomes.