Phenolphthalein and Ortho-Tolidine Combination Kit

Many investigators use the combination of these two tests as a presumptive test and confirmatory test for the presence of blood.  This kit is packaged in a plastic box containing all the premixed chemicals and supplies required to conduct both the Phenolphthalein Presumptive Blood Test and the O-Tolidine Test.  The premixed liquid reagents are in plastic dropper bottles.  A non-human known blood standard is included to monitor the results.