LITMUS


Meaning of LITMUS in English

n.

Mixture of coloured organic compounds obtained from several species of lichen s.

In the form of a water solution or as litmus paper, it is the oldest and most-used indicator of whether a substance is an acid or a base . It turns red or pink in acid solutions and blue or purple-blue in alkaline solutions.

Britannica Concise Encyclopedia.      Краткая энциклопедия Британика.