Resorcinol-Fuchsin, Weigert alcoholic, is a staining solution used in histology and cytology. In particular, it is used to stain elastic fibers found in many tissue types, including skin, blood vessels, and lung.

The staining solution consists of a mixture of resorcinol, fuchsin, and alcohol. Resorcinol serves as the coupling component, while fuchsin is the dye that stains the elastic fibers. In combination, these components allow selective staining of the elastic fibers, which present an intense purple color.

The alcohol version of the resorcinol-fuchsin solution according to Weigert has the advantage that it penetrates quickly into the tissue and allows precise staining of the elastic fibers. The staining is also suitable for combination with other staining methods to allow more detailed visualization of the various tissue components.