Thiazole orange (TO) is a nucleic acid dye commonly used in reticulocyte analysis to stain residual RNA of blood cells, or to stain DNA in agarose gels and capillary electrophoresis. Thiazole Orange stains the yeast nucleus, and is also able to stain bacteria and mammalian cells. The dye has an excitation/emission of 512/533 nm when bound to DNA. Properties: Orange solution; Store dessicated at 4°C, protect from light; Ex/Em= 512/533 nm (with DNA); C26H24N2O3S2; MW: 476.61; [67-68-5].