Blood Stain Detection and Identification: Foundations (UGC-NET Unit III)

UGC-NET Forensic Science Unit III drill on detection and identification of blood stains at the foundations level. Covers presumptive colour tests (Kastle-Meyer with phenolphthalein, Leuco-malachite green, Tetramethylbenzidine, the historical and carcinogenic Benzidine), Luminol chemiluminescence for latent and cleaned stains, confirmatory crystal tests (Teichmann haemin and Takayama haemochromogen), spectroscopic confirmation through the Soret band of haemoglobin, common interferences from horseradish peroxidase, copper salts, rust and bleach, sensitivity benchmarks for Luminol down to 1 in 10,000 dilution, proper collection of wet and dried stains, aging of bloodstains through oxyhaemoglobin to methaemoglobin to hemichrome, identification of menstrual versus venous blood via D-dimer ELISA, rapid immunochromatographic tests (RSID-Blood, Hexagon OBTI), species identification through Ouchterlony precipitin, and bloodstain pattern analysis basics (passive, transfer and projected patterns, angle of impact, area of origin).

Built for UGC-NET Paper II Forensic Science aspirants, NFSU MSc Forensic Biology and Serology students, FACT candidates, and CFSL Biology Division trainees who need a quick concept refresh on serology foundations.

Topics covered:

• Kastle-Meyer test and phenolphthalin chemistry
• Luminol chemiluminescence and 1 in 10,000 dilution sensitivity
• Leuco-malachite green and Tetramethylbenzidine
• Benzidine carcinogenicity (IARC Group 1) and modern replacements
• Teichmann and Takayama confirmatory crystal tests
• Soret band absorption peak of haemoglobin near 415 nm
• Interferences (horseradish peroxidase, copper, rust, bleach)
• Menstrual versus venous blood and D-dimer ELISA
• Bloodstain pattern analysis basics and angle of impact

Easy-band questions calibrated for first-pass UGC-NET preparation. Allow 30 minutes.