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Video spectral comparator

LGC Forensics use a VSC 2000HR (Video Spectral Comparator), manufactured by Foster and Freeman for the specialised lighting examination of documents.
This instrument is capable of viewing and recording the response of documents/inks when exposed to light of various wavelengths. This is useful for the examination and comparison of inks, the examination of security features in documents such as passports and driving licences, the examination of altered or obliterated entries and the examination of entries which have faded or been washed out.
The following lights and techniques may be used in combination:
  • Visible lighting
  • Infrared lighting
  • Infrared luminescence
  • Ultraviolet light
  • Transmitted light
  • Coaxial lighting
  • Oblique lighting