Naphthol AS-OL Phosphate is a substance for the histo-chemical determination of phosphatases. It is noted as a fluorescent organic compound that is white solid. It is an isomer of 2-naphthol divergent by the site of the hydroxyl assembly on the naphthalene circle. Being more reactive, it may serve as the precursors to a variability of beneficial compounds. These have diverse functionality in water based paints as well as coatings. Also, these are functional in the processing of various ceramics. Naphthol AS-OL Phosphate can also be used as the biomarkers for livestock as well as humans, if wide-open to polycyclic aromatic hydrocarbons.