Related Experiment Video
Updated: Jan 21, 2026
05:11
In Vivo Visualization of Calcium Transients during Fertilization and Early Development in C. elegans
Published on: July 12, 2024
936
Fixing Transient Iodine on Developed Latent Fingermarks
Kirti Kumari Sharma1,2, Gavash Harsha Kannikanti1,2, Tulsidas Ramachandra Rao Baggi3
1Fluoro and Agrochemicals Division, CSIR-Indian Institute of Chemical Technology, Uppal Road Tarnaka, Hyderabad, 500007, India.
Journal of Forensic Sciences
|August 8, 2019
Summary
A new fume-mist technique efficiently fixes latent fingermarks developed with iodine. This method uses iodine fumes and solvent spraying to create clear, permanent fingerprint images on paper surfaces.
Area of Science:
- Forensic Science
- Chemistry
Background:
- Latent fingermarks developed with iodine are transient.
- Iodine interacts with fingermark residues and organic solvents, forming colored complexes.
Purpose of the Study:
- To describe a novel fume-mist technique for fixing latent fingermarks developed with iodine.
- To enhance the permanence and clarity of iodine-developed fingermarks on paper surfaces.
Main Methods:
- Latent fingermarks were developed on paper using iodine fumes.
- The developed fingermarks were fixed by spraying with polar and nonpolar solvents.
- A fume-mist technique was employed for efficient fixation.
Main Results:
- The technique produced clear and permanent latent fingermarks.
- The stability is attributed to the formation of a ternary structure involving fingermark residue, iodine, and solvent.
Conclusions:
- The fume-mist technique offers an efficient and simple method for developing and fixing latent fingermarks on paper.
- The method is adaptable for routine forensic applications due to ease of use and readily available chemicals.
Related Concept Videos
01:06Fixed Action Patterns
17.5K
A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
17.5K
01:13Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene
7.4K
Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
7.4K
02:04Fixing Double-strand Breaks
14.3K
The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
14.3K
02:04Fixing Double-strand Breaks
4.3K
4.3K
01:22Series R—L Circuit Transients
386
In a series resistor-inductor (R-L) circuit, closing the switch at the start of the time period simulates a three-phase short circuit, a fault condition where all three phases of an unloaded synchronous machine are short-circuited. When there is no fault impedance and no initial current, the initial voltage is determined by the phase angle of the source voltage.
Using Kirchhoff's Voltage Law (KVL) to analyze this circuit helps determine the total asymmetrical fault current, which consists...
Using Kirchhoff's Voltage Law (KVL) to analyze this circuit helps determine the total asymmetrical fault current, which consists...
386
01:24Growth versus Fixed Mindset
264
Carol Dweck introduced the term mindset to describe individuals' beliefs about their intellectual and personal capabilities. These beliefs significantly influence psychological processes such as motivation, goal-setting, and perseverance, ultimately shaping academic and life outcomes. Individuals generally possess one of two mindsets- a fixed or a growth mindset—each promoting different responses to success, failure, and challenge.Fixed vs. Growth MindsetA fixed mindset assumes that one's...
264