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F-35200
Phenolphthaleine presumptive test set for blood.
![](/images/content/5-biological-traces/phenolphthalein_reactions.png)
Left: phenolphthalin. Middle: after oxidation and removing of a proton by a base the pink phenolphthalein is formed. Right: in an acidic environment a colorless form of phenolphthalein is formed.
See also Wikipedia.