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Suffering from the rapid depletion of the natural resource, the current world scenario calls for the need of sustainable development so as to obtain ecofriendly environment. Flowers impart beauty to the nature, pleasure to the heart and attract insects for pollination by their diversified colour, fragrance, shape and size. The variation in colour of flowers is due to the presence of pigments present in the petals or bracts. One of these pigments is anthocyanin which is a natural plant pigment. These pigments impart different colours in acidic and basic medium. This change in colour forms the basis for using flower sap as indicator in acidimetry and alkalimetry. Synthetic indicators are good choice for acid base titration. But due to environmental pollution, less availability and high cost of synthetic indicator, the search for natural compounds as an acid base indicator started. Natural indicators are easy to prepare, are easily available and promising results are obtained when tested against standard synthetic indicators.
Gupta et al. (2024) studied this question.
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