Alamar Blue(TM) is a safe, nontoxic aqueous dye that is used to assess cell viability and cell proliferation and is supplied as a sterile indigo colored liquid. Alamar Blue has also been shown to be a rapid and simple non-radioactive assay alternative to the [3H] thymidine incorporation assay. Applications: Suitable for use in Cell Viability Assessment and Cell Proliferation Assessment. Storage and Stability: May be stored at 4°C, -20°C or -70°C. When stored frozen, it is important to warm to 37°C upon thawing and mixed well to be assured of complete resolubilization. Protect from light. Storage at RT under lighted conditions adversely affects its absorbance properties.