The absorption maxima of anthocyanins extracted from rose and cabbage were recorded around 530 nm (Figs. 1, 2). Absorption maxima of 524–534 nm were recorded for anthocyanins extracted from red cabbage [15]. Recording of similar observation confirmed the extraction protocol was proper. Further, absorption spectrum of indicator solution from red cabbage was higher than rose which confirmed that extract from red cabbage had higher amount of anthocyanins in indicator solution than rose. Hence, indicator solution from red cabbage was used for further experiments.