Eosin Y is a tetrabromo derivative of fluorescein. Eosin B is a dibromo dinitro derivative of fluorescein. Haematoxylin stain is commonly followed (or counterstained) with another histologic stain, eosin. He experimented with solutions of fluorescein, eosin, and other dyes at various temperatures and viscosities. The cytoplasm is full of granules that assume a characteristic pink-orange color with eosin staining. It is classically a mixture of eosin (red) and methylene blue dyes. Structures that stain readily with eosin are termed eosinophilic. When stained with hematoxylin and eosin, they appear brightly eosinophilic and smudged. Giemsa's solution is a mixture of methylene blue, eosin, and Azure B. Red inks usually contain the dye eosin. The blood sample can be a thick smear, stained with Giemsa or hematoxylin and eosin. The proximity of eosin molecules leads to the quenching of its fluorescence. Eosinophils (basic components that like acids) are dyed red by the acid stain, eosin. It can be distinguished by its pale color when stained with haematoxylin and eosin. The dye eosin is commonly used for red ink.