DAVTECH Analytical Services (Canada) Inc

Phenolphthalein and O-Tolidine Combination Presumptive Blood Tests

in: Chemicals

Often investigators will also use a combination of Phenolphthalein and O-Tolidine Presumptive Blood Tests to indicate the presumptive presence of blood.

Phenolphthalein is one of the most commonly used chemicals in the field and forensics laboratory to indicate the presence of blood. O-Tolidine is often used after a phenolphthalein blood test to confirm that a suspected stain presumptively may be blood and should be collected for confirmatory testing.

Using TTF's Phenolphthalein and O-Tolidine Presumptive Blood Tests are quick and simple. Each test is administered by first collecting a positive control using the supplied Known Bloodstain Control. Next, a sample of the suspected stain should be collected using either a piece of filter paper or a cotton-tipped swab. One drop of each of the reagents is then applied to the collected sample in the order defined in the directions. The results will be indicated by a specific colour change, depending on the reagent used for testing.

TTF's Phenolphthalein and O-Tolidine Presumptive Blood Test Kit is packaged in a durable, lightweight plastic box for easy and safe transport from one crime scene to another. It includes all the premixed chemicals and supplies required to conduct both the Phenolphthalein and O-Tolidine presumptive blood tests. All of the reagents are supplied in plastic dropper bottles for easy use. The kit also includes Known Bloodstain Controls to ensure that the test results are accurate. All kit components are also available to reorder individually as needed.

KIT COMPONENTS:   
•    Plastic Kit Box, 10.5"L x 7" W x 2.25" H
•    Phenolphthalein Reagent – 1.5 oz Dropper Bottle
•    O-Tolidine Reagent – 1.5 oz Dropper Bottle
•    Alcohol Reagent – 1.5 oz Dropper Bottle
•    Hydrogen Peroxide Reagent – 1.5 oz Dropper Bottle (2 per kit)
•    Distilled Water – 1.5 oz Dropper Bottle (2 per kit)
•    Box of Filter Paper
•    Box of 3” Cotton-Tipped Swabs
•    Known Bloodstain Control (2 per kit)
•    Kit Instructions Affixed to Inside of the Box

Part Number(s):

CHE-1206 - Phenolphthalein and O-Tolidine Combo Presumptive Blood Test Kit 
CHE-1101 - Known Blood Control Card - 1/pkg  
CHE-1201 - Phenolphthalein Reagent - 1.5 oz. dropper bottle 
CHE-1202 - Phenolphthalein Reagent - 125mL. bottle
CHE-1203 - Filter Paper for Stain Sampling - 100/pkg
CHE-1205 - O-Tolidine Reagent Refill - 1.5 oz dropper bottle
CHE-1207 - Filter Paper Patches for Stain Collection - 100/pkg 
CHE-1209 - Alcohol Reagent - 1.5 oz. dropper bottle
CHE-1210 - Hydrogen Peroxide Reagent - 1.5 oz. dropper bottle
CHE-1213 - O-Tolidine Reagent Refill - 125 mL. dropper bottle
CHE-1217 - Alcohol Reagent - 125 mL. bottle
CHE-1218 - Hydrogen Peroxide Reagent - 125 mL. bottle


Home Products Forensic Evidence Collection Chemicals Phenolphthalein and O-Tolidine Combination Presumptive Blood Tests

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