Endpoint of Titration
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URL (link address) for this media:
http://www.dvaction.org/dvaction/movies/progressive/euc-NU-0025.mov

The endpoint has been reached when the first permanent color change occurs. A color change that lasts longer than 30 seconds is usually considered permanent. The color change at the endpoint should be as faint as possible to prevent overtitration.
It is often helpful to use an untitrated solution as a comparison.