by Dominic Robert (Author) There are several applications for the synthetic dye and medicine known as methylene blue. The following is a list of its most important interpretations: - Stain for Biological Tissues and Cells: Methylene Blue is a well-known biological stain that is frequently utilized in laboratories for the purpose of staining biological tissues and cells. It is possible to use it in microbiology, as well as in histology and cytology, in order to improve the visibility of particular structures when viewed via a microscope. - Medication: Methylene Blue is used in the medical field for a variety of therapeutic uses. Methemoglobinemia, a disorder in which the amount of oxygen that hemoglobin is capable of carrying in its molecules, can be treated using this substance.