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1Colours of universal indicators at different pH values

pH Colour

3.0 --------------------------------------------------------- Red

5.0 --------------------------------------------------------- Orange-red

5.5 --------------------------------------------------------- Orange

6.0 --------------------------------------------------------- Orange-yellow

7.0 7.5 ------------------------------------------------ Greenish yellow

8.0 --------------------------------------------------------- Green

9.0 --------------------------------------------------------- Blue

10.0 ------------------------------------------------------- Violet

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