Litmus is a water soluble mixture of different dyes extracted from lichens. It is absorbed onto a filter paper to produce one of the oldest forms of pH indiactor, used to test materials for acidity/basicity.
Amarjit
Last Activity: 7 Years ago
Because it gives characteristic colur in basic and acidic medium.In basic medium it turns bluish and in acidic medium it turns red.
Priyansh
Last Activity: 7 Years ago
it is extracted from lichens nd shows a ntural and an inbuilt pH scale.
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