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Phenolphthalein is used to perform a presumptive blood test, and is commonly known as the [[Kastle-Meyer test]]. A dry sample is collected with a swab or filter paper. First a few drops of alcohol, then a few drops of phenolphthalein and finally a few drops of hydrogen peroxide are dripped onto the sample. If the sample turns pink then it is a positive test. This test is nondestructive to the sample, it can be kept and used in further tests at the lab. This test has the same reaction with human blood and animal blood so further testing would be required to determine which it is.
==External links==
*[http://www.chemguide.co.uk/physical/acidbaseeqia/indicators.html Page on different titration indicators, including phenolphthalein]
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