Eosine yellow by Research Lab Fine Chem Industries is a high grade reagent. Also known as ethyl eosin, this is a form of eosin, a fluorescent acidic compound. The reagent is available as a red powder which is soluble in water. While it is stable under general conditions, this reagent is incompatible with strong oxidizing agents. CAS No.: 17372-87-1 Quantity Provided: 25 gm per bottle Molecular formula: C20H6Br4Na2O5 Molecular weight: 691.85 Assay: 85 % Eosine yellow has a variety of applications in chemical and biological sectors. This compound finds several applications in the synthesis of various organic derivatives. Eosin yellow is used to stain cells and tissues as a biological stain. It is applied as a counterstain after hematoxylin and prior to methylene blue. It has been applied to determine the location of the brain sections, for staining fixed liver tissues, and as a background stain, which provides contrast to the nuclear stains. This reagent is suitable for the industrial synthesis of products and research applications.