Xylidine Ponceau by Research Lab Fine Chem Industries is a high grade reagent. Also known as Ponceau 2R among many names, this organic compound is an azo dye. The reagent is available as a red powder which is easily soluble in water and slightly soluble in ethanol. The compound is stable under general conditions, however, it is incompatible with strong oxidizing agents. CAS No.: 3761-53-3 Quantity Provided: 25 gm per bottle Molecular formula: C18H14N2Na2O7S2 Molecular weight: 480.43 Assay: Minimum 60 %Xylidine Ponceau has a variety of applications in chemical and biological sectors. This dye solution is majorly used only in the Masson's trichrome stain as a red counterstain, where it imparts an orange hue to the red-stained cytoplasmic structures. It is furthermore used to prepare Fuchsin-Ponceau solution to stain an amyotrophic lateral sclerosis tissue-engineered skin model (ALS-TES). This reagent is suitable for industrial synthesis of products and research applications.