Universal indicator - Is used to show the pH of an acid or alkali, Acid - Vinegar is an example of one, Alkali -  Bleach is an example of one, Blue - Red litmus colour change in alkali, Red - Blue litmus colour change in acid, Red cabbage - the best natural indicator, The best indicators are different colours in acid and alkali - what is a feature of a good indicator?, Litmus paper - a type of indicator,

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