One of these molecules is synthesized by the addition of two phenols to an acid anhydride that is produced using a vanadium catalyst.
One of these molecules is synthesized by the addition of two phenols to an acid anhydride that is produced using a vanadium catalyst. A similar one has the highest known value of Kreft's index and is used in gel electrophoresis. They include many triarylmethane dyes, including one whose several forms have an isosbestic point at around 515 nanometers, as well as anthocyanins. A "universal" one is typically a mix of many of them with different transition ranges. Cresol purple is the precursor to another one, bromocresol green. For 10 points, name these compounds that change color depending on the pH of a solution, including phenolphthalein and litmus.
One of these molecules is synthesized by the addition of two phenols to an acid anhydride that is produced using a vanadium catalyst.
pH indicator [prompt on dye before "universal"] 