Giemsa stain pure, also known as Giemsa solution or Giemsa stain, is a widely used biological stain in laboratory settings for the staining of various cell types, including blood cells, parasites, and microorganisms. It is named after the German scientist Gustav Giemsa, who developed the staining technique in the late 19th century.

Giemsa stain is a mixture of methylene blue, eosin, and other azur-based dyes. The exact composition may vary depending on the specific manufacturer and intended application. The stain is prepared by diluting the Giemsa powder or liquid concentrate in a suitable solvent, typically methanol or buffered water.