Giemsa stain
Wright's stain can be used alone or in combination with the Giemsa stain, which is known as the Wright-Giemsa stain. Wright's stain is named after James Homer Wright who in 1902 published a method using heat to produce polychromed methylene blue, which is combined with eosin Y. The polychromed methylene blue is combined with eosin and allowed to precipitate, forming an eosinate which is redissolved in methanol. The addition of Giemsa to Wright's stain increases the brightness of the "reddish-purple" color of the cytoplasmic granules. The Wright's and Wright-Giemsa stains are two of the Romanowsky-type stains in common use in the United States and are mainly used for the staining of blood and bone marrow films.