In taste research, people are classified as "tasters" or "non-tasters" based on their sensitivity to ptc, which tastes "bitter".
People are delegated tasters or non-tasters in light of their capacity to distinguish the intensity or bitterness of PTC/PROP (Phenylthiourea/6-n-propylthiouracil). Sodium benzoate (a sustenance additive), potassium benzoate taste all the more severe to tasters of PTC/PROP than to non-testers.