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Eosin is also used as a red dye in inks; however, the molecule, especially that of eosin Y, tends to degrade over time, leaving behind its bromine atoms, hence causing paint incorporating such a dye to obtain a darker brown tinge over time. [12] A notable user of eosin dye was the Post-Impressionist painter Van Gogh.
Eosin Y is commonly used as the red dye in red inks. It is commonly used in histology, most notably in the H&E (Haematoxylin and Eosin) stain. [1] Eosin Y is also widely used in the Papanicolaou stain (or Pap stain used in the Pap test) and the Romanowsky type cytologic stains. [1] [2] It is also used as a photosensitizer in organic synthesis. [4]
Eosin is an anionic (negatively charged) and acidic stain. [5] [10] The staining of nuclei by hemalum (a combination of aluminum ions and hematein) [14] is ordinarily due to binding of the dye-metal complex to DNA, but nuclear staining can be obtained after extraction of DNA [14] from tissue sections.
Eosin is an acidic dye for staining cell cytoplasm, collagen, and muscle fibers. [1] [2] Eosinophilic describes the appearance of cells and structures seen in histological sections that take up the staining dye eosin. [2] Such eosinophilic structures are, in general, composed of protein. [3]
Eosin methylene blue (EMB, also known as "Levine's formulation") is a selective and differential media used for the identification of Gram-negative bacteria, [1] specifically the Enterobacteriaceae. EMB inhibits the growth of most Gram-positive bacteria .
Eosin may also be used as a counterstain in some variants of Gram staining, and in many other protocols. There are actually two very closely related compounds commonly referred to as eosin. Most often used is eosin Y (also known as eosin Y ws or eosin yellowish); it has a very slightly yellowish cast. The other eosin compound is eosin B (eosin ...
Eosin B: Eosine bluish Imperial red Acid red 91 45400 fluorone 548-24-3: Eosin Y ws Eosine yellowish Bromoeosine Tetrabromofluorescein Acid red 87 45380 fluorone 17372-87-1: Eriochrome Black T: Chrome black Mordant black 11 14645 azo 1787-61-7: Erythrosin B: Red No. 3 Food red 14 Acid red 51 45430 fluorone 16423-68-0: Ethyl eosin Alcohol ...
Eosin B is a form of eosin which is a dye compound. [1] [2] There is another form [3] of eosin B dye and its chemical name is 4, 5-dibromo-2, 7dinitro- fluorescein or ...