Foster+Freeman VSC8000
Definition
The current-generation forensic document examination workstation produced by Foster+Freeman Ltd (UK), used by the FBI Laboratory, DSTL (UK), CFSL (India), AFP (Australia), and national laboratories across the ENFSI network.
- Manufacturer
- Foster+Freeman Ltd, UK
- Function
- Video spectral comparator for document examination
- Detects
- Alterations, obliterations, ink differences
- Users
- FBI Laboratory, DSTL, CFSL India, AFP
Common questions
What kinds of document alterations can a VSC8000 reveal that are invisible under normal light?+
It combines oblique, transmitted, UV, and infrared illumination with multispectral imaging to reveal erasures, added or substituted text, differing ink formulations that look identical to the eye, and security features like watermarks or fluorescent fibres.
Why do different inks that look the same under white light show up differently under infrared examination?+
Inks with different chemical compositions, even similar visible colour, often absorb or reflect infrared light differently depending on their dye or pigment content, so entries written at different times or with different pens can be distinguished even when a human eye sees no difference.
Is VSC examination alone sufficient to prove a document was altered?+
It provides strong supporting visual and spectral evidence but is typically combined with other techniques such as ink chemical analysis, indented writing recovery, and handwriting comparison to build a complete forensic document conclusion.
Related terms
- ENFSI Document and Handwriting Working Group
- The European Network of Forensic Science Institutes working group responsible for harmonising best-practice guidelines for forensic document examination across European national laboratories.
- IR-Cut Filter
- A filter placed in the camera optical path that blocks near-infrared radiation, allowing only visible-range light to reach the sensor; must be...
- IR Luminescence
- Emission of near-infrared radiation by ink dye molecules when excited by visible light; different ink formulations luminesce at different intensities, allowing differentiation...
- IR Transmission
- Examination of a document with infrared radiation transmitted from below; exploits the IR-transparency of titanium dioxide in correction fluid to image underlying...
- Oblique-Light Illumination
- Illumination of a document surface at a very low angle (5-20 degrees) to create disproportionately long shadows from surface irregularities, revealing mechanical...
- Optical Brightening Agent (OBA)
- A fluorescent compound added to paper pulp or coatings that absorbs UV-A radiation and re-emits it as visible blue light, making paper...
- Transmitted-Light Examination
- Examination of a document with diffuse illumination from below, making paper thickness variation, watermarks, erasure thinning, and some obliterations visible as brightness...
- Video Spectral Comparator (VSC)
- A multispectral imaging instrument combining UV, visible, and near-infrared illumination with selectable emission filters and a calibrated digital camera; the primary bench...
- Watermark
- A pattern formed in paper during manufacture by localised fibre-density variation on the Fourdrinier wire; visible in transmitted light as a lighter...