Lavanya D, G. shekhar . G, P. . A, and P. . A. “Green Chemistry: A Study on Acid-Base Indicator Property of Various Flower Pigments”. International Journal of Research and Development in Pharmacy & Life Sciences, vol. 7, no. 6, Dec. 2018, pp. 3155 -63, doi:10.21276/IJRDPL.2278-0238.2018.7(6).3155-3163.