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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 25C). Absorbed on to filter paper to make litmus papers it is one of the oldest pH indicators.

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... in broadcast HDTV signals and the Palladium operating system. A wide variety of DRM systems have also been employed to restrict access to eBooks[?]. See the TCPA / ...

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