Swimming Pool Chemicals manufacturer / supplier in China, offering 2,2-bis(p-hydroxyphenyl)phthalide Regulates acidity and alkalinity CAS:77-09-8 PH reagent Dye intermediates, Phenolphthalien CAS:77-09-8 C20H14O4 Regulates acidity and alkalinity Used to set the dye color toner, Phenolphthalein ACS C20H14O4 PH Indicator Measure Acid-base used in chemical experiments and so on.