Phenolphthalein Paper Testing have been developed with a mixture of several indicators which on contact with the sample solution assume a particular color. A check against the color comparison table supplied allows the parameter to be determined. AQUASOL range offers a range of Phenolphthalein PAPER indicator and other test papers to meet your specific testing needs. Our AQUASOL Phenolphthalein Paper combine ease-of-use with accuracy consistency and unmatched quality.