medium, red litmus paper turns blue. In short, it is a dye and indicator which is used to place substances on a pH scale.

History

The word "litmus" comes from the Old Norse word "litmosi" meaning "colour moss" or "colouring moss". The word is attested only in one Medieval source, a Norwegian law codex from 1316 in a chapter on customs and excise duties on pelts and furs. Circa 1300, the Catalan physician Arnaldus de Villa Nova

1.Previous
3.Next