Blood Enhancement
Crowle's Double Stain
DISCLAIMER: Area of suspected blood must be dry prior to the application of Crowle’s Double Stain.
1. Select an application method.
Tray immersion: Submerge item in Crowle’s Double Stain solution for 30 – 90 seconds.
Spray application: Spray Crowle’s Double Stain solution onto item until coated and leave for 30 – 90 seconds.
2. Rinse with water or apply Coomassie Blue Rinse/Destain for 1 minute.
3. Ridges will develop a blue color. Repeat steps 1 and 2 as necessary until maximum contrast is achieved.
4. Allow item to air dry.
5. Capture ridge detail with 1:1 photography.
View under
Normal Vision
Goggles / Filter
None
Development Color
Blue
REFERENCES
BVDA. Crowle’s Stain. Retrieved from https://www.bvda.com/en/crowles-stain-for-shoeprints
Chesapeake Bay Division, International Association for Identification. (2010). Latent Fingerprint Processing Techniques – Selection & Sequencing Guide, “Crowle’s Double Stain”. Retrieved from https://www.cbdiai.org/crowles-double-stain.html
FBI Laboratory Division. (2000). Processing Guide for Developing Latent Prints. “Crowle’s Double Stain”, pp. 49-50. https://archives.fbi.gov/archives/about-us/lab/forensic-science-communications/fsc/jan2001/lpu.pdf