Encyclopedia > Litmus

Article Content

Litmus

Litmus is a water-soluble dye extracted from certain lichens. It turns red under acid conditions and blue under alkaline conditions, the colour change occurring over the pH range 4.5-8.3 (at 25°C). Absorbed on to filter paper to make litmus papers it is one of the oldest pH indicators.

All Wikipedia text is available under the terms of the GNU Free Documentation License

Search Encyclopedia

Search over one million articles, find something about almost anything!

Featured Article

Rameses

... from Rameses Ramses, also spelled Rameses, is the name of several Egyptian pharaohs: Ramses I[?] Ramses II ("The Great") Ramses III Ramses IV[?] The name means ...