Human bloodstains dried for years may still give a positive reaction for a precipitin test.

Name: Human bloodstains dried for years may still give a positive reaction for a precipitin test.
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Even after years, dried human bloodstains can still contain proteins that react positively in a precipitin test, which is used to identify the presence of specific proteins, such as those found in blood.

Human Bloodstains Dried for Years May Still Give a Positive