Documents- Instrumental
- Created by: s013693b
- Created on: 03-05-14 23:06
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- Documents- Instrumental
- Non destructive document analysis
- ESDA
- Impressions of writing can be seen on the paper beneath
- Disturbance of paper fibres
- Strength of impressions depend on:
- Writing instrument used
- Pressure when writting
- How many sheets down from the sheet which was written
- Limitations
- Soaking in water removes impressions
- Secondry indentations can occur when two pieces of paper containing indentations come into contact
- False conclusion that the papers were from one single stack
- Sometimes ESDA fails to detect very deep indentations
- Impressions can be enhanced by humidifying the document
- Over humidifying can cause loss of impressions
- Soaking in water removes impressions
- Over humidifying can cause loss of impressions
- 1. Electrostatic charge induced on paper surface
- 2. Indented areas attract higher charge density
- 3. Photocopier toner attracted to these areas
- 4. Writing become visible
- Depending on the depth of indentations ESDA trace is either lighter or darker than background
- Shallower indentations appear darker against the background and vice versa.
- Impressions of writing can be seen on the paper beneath
- Filtered Light Analaysis
- Analysis of inks under verifying light conditions
- Visually identical inks can show distinct properties under carrying light conditions
- Low intensity
- High Intensity
- Untitled
- Analysis of inks under verifying light conditions
- Spectroscopic methods
- Infrared
- UV Visible
- Raman
- ESDA
- Untitled
- Non destructive document analysis
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