Synthesis chemical lab is one of the best and leading supplier of chemical wholesale and retail traders. We are leading supplier of chemicals speciality chemicals. Synthesis chemical Lab are the supplier of Thymolphthalein indicator AR - Synthesis Chemical Lab. Thymolphthalein Indicator AR is a pH indicator and reagent for blood that is used in laboratories Properties. Thymolphthalein Indicator AR is a white crystalline powder with an inky blue color. It is colorless in acidic to neutral pH levels and turns blue in basic conditions. It has a transition range of around pH 9.3–10.5. Thymolphthalein indicator AR is used in disappearing ink, to make color-change bubbles, and as a pH indicator. It is particularly useful for detecting when a solution transitions from being slightly basic to more strongly basic. Thymolphthalein indicator AR is also known as 5', 5''-Diisopropyl-2', 2''-dimethylphenolphthalein. Synthesis Chemical lab is a one stop solution for your all kind of chemical needs. - Synthesis Chemical lab.