An indicator is a halochromic chemical compound added in small amounts to a solution so the pH of the solution can be determined visually. [1] Hence a pH indicator is a chemical detector for hydronium ions or hydrogen ions in the Arrhenius model. [2][3] As most naturally occurring organic compounds are weak protolyte, carboxylic acid and amines pH indicator find many applications in biology and analysis. The term pH stands for potential hydrogen and is the measurement of how many hydrogen ions symbolized by H+ are in solution. The more ions, the more acidic. A high number of hydroxide ions, symbolize by OH- characterizes basic or alkaline substances. Plumeria (also known as Frangipani) is a genus of flowering plants in the family Apocynaceae. Most species are deciduous shrubs or small trees. A single Plumeria tree can produce around 50-60 flowers and grows to a height of 35 feet. In traditional system of medicine of India Plumeria species are widely used as purgative, remedy for diarrhea, cure of itch, bronchitis, cough, asthma, fever, piles, dysentery, blood disorder and tumors.[4]