2-2--azino-di-(3-ethylbenzothiazoline)-6-sulfonic-acid and titanium-dioxide

Fingermarks formed in or by blood often require specific development techniques. This review examines techniques and materials that may be used to enhance and record fingermarks deposited in blood or fingermarks generated by blood-contaminated papillary ridges. A large number of techniques are presented here and are discussed from a chemical as well as practical perspective. It is concluded that an optimized sequence of techniques targeting both latent (non-bloody) and bloody fingermarks must be applied to detect and enhance the maximum number of marks, and therefore optimize the information content from exhibits that may bear marks in blood.

Topics: Amine Oxidase (Copper-Containing); Benzenesulfonates; Benzidines; Benzothiazoles; Blood; Blood Stains; Coloring Agents; Dermatoglyphics; Forensic Sciences; Gentian Violet; Humans; Indicators and Reagents; Light; Luminescence; Methanol; Molecular Structure; Salicylates; Solvents; Sulfonic Acids; Titanium

The enzyme horseradish peroxidase is extensively inactivated by UVA exposure in the presence of TiO2, a common ingredient of sunscreens and cosmetics. The effect is attributed to the generation of reactive oxygen species, as indicated by the inactivation enhancement observed in the presence of air.

Topics: Benzothiazoles; Horseradish Peroxidase; Photosensitizing Agents; Sulfonic Acids; Titanium; Ultraviolet Rays