Petal colour change in basic solution

Petal colour change in basic solution

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Caption: Wishbone (Torenia fournieri) flower that has had sodium hydroxide solution dropped on to its petal. Where the basic solution has hit, the petal has changed colour from purple to yellow. Many flowers act as indicators, changing colour on contact with acid or bases.

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Keywords: acid, base, black background, chemical, chemistry, color, colour change reaction, flower, indicator, laboratory, no-one, nobody, petal, reacting, reaction, sodium hydroxide, solution, torenia fournieri, wishbone

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