Phenolphthalein: Changes to one colour, Pink in alkali, Colourless in acids and water, Methyl Orange: Changes to two colours, Red in acids, Yellow in water and alkali, Bromothymol Blue: Changes to three colours, Yellow in acids, Green in water, Blue in alkali, Universal: Changes to many colours, Red, orange, yellow in acids, Green for neutral, Blue and purple in alkali,

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