aldehyde fuchsin

al·de·hyde fuch·sin

a stain using basic fuchsin paraldehyde and hydrochloric acid; it produces violet staining of elastic fibers, mast cell granules, gastric chief cells, β cells of the pancreatic islets, and certain hypophyseal β granules; other pituitary granules and cells stain in other colors.
See also: Gomori aldehyde fuchsin stain.