How grapes indicator reacts with acid and base?
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Blue grapes contain a monoglucoside of malvidin, which changes from deep red in an acidic solution to violet in a basic solution. ... Esculin is colorless at pH 1.5 but becomes fluorescent blue at pH 2. Get the best effect by shining a black light on the indicator.
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Grapes: Red and purple grapes contain multiple anthocyanins. Blue grapes contain a monoglucoside of malvidin, which changes from deep red in an acidic solution to violet in a basic solution. Horse Chestnut Leaves: Soak horse chestnut leaves in alcohol to extract the fluorescent dye esculin.
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