Based on their sensitivity to ptc, which tastes "bitter".PTC or Phenylthiocarbamide is an organosulfur thiourea comprising a phenyl ring. It has the unordinary property that it either tastes severe or is for all intents and purposes tasteless, contingent upon the hereditary character of the tester. The capacity to taste PTC is frequently regarded as a prevailing hereditary quality, despite the fact that legacy and articulation of this attribute are to some degree more perplexing.