3. Chamberlink Sep 2025 49-72.qxp_Chamberlink 29/08/2025 10:46 Page 50
FEATURE: LEGAL SERVICES
Seeing
beyond the ink: Tools for verifying documents
By Elisabeth Briggs, forensic document examiner, QD Examiners
F
orensic document examiners are often asked to determine whether or not a signature is genuine, whether a page has been substituted, or whether an anonymous note came from a particular writer. Most instructions involve handwriting or signature comparison - typical cases include authenticating a signature on a will, confirming the author of a Land Registry TR1 form or linking a set of unsigned letters to one author. It is important to note that forensic handwriting examination is not graphology: it does not involve the pseudo-science of assessing personality, character or psychological traits through handwriting. Instead, it is a structured comparison of writing features including the construction of letters, joins between characters and fluency of the pen strokes – based on established forensic principles. Handwritten entries do not always tell the whole story. Two laboratory instruments – the video spectral comparator (VSC) and the electrostatic detection apparatus (ESDA) allow an examiner to look beyond the ‘visible’ layer and consider the difficult questions of when and how a document, or part of a document, was created or whether it could have been altered.
Video spectral comparator: revealing differences in inks and papers A VSC is a specialised imaging system that visualises a document in ultraviolet, infrared and transmitted light, while a high resolution camera records the results. Because different inks, toners and paper fibres react distinctively at specific wavelengths, hidden inconsistencies can be revealed: • Ink variation – entries that look identical in daylight may react differently under infrared light, revealing that a different pen was used to add text, or to amend a date or amount. • Erasures and abrasions – oblique lighting highlights minute surface damage. 50 CHAMBERLINK September 2025
Image A – visible image
the powder clings only where those indentations disturb the charge, creating an image of words invisible to the eye. The process is nondestructive and can recover valuable evidence without damaging the document. Indentations can show what was written on a missing page, reveal erased diary entries, or expose the rewriting of documents. ESDA examinations of witness statements have helped overturn wrongful convictions. Alternatively, a staff appraisal completed and signed last week may bear impressions of another appraisal allegedly completed months earlier; an anonymous letter might show impressions of a name and address.
Choosing the right tool
Image B – viewed using specialised lighting
• Embedded security features – watermarks, fluorescent fibres and yellow dot patterns become visible, helping verify official forms and ID, or link printed documents. For solicitors and businesses, the value can be significant. A disputed invoice total, a hastily added page or clause to a contract, or an altered tenancy date, can be examined without damaging the original document. Clear VSC photographs can provide visual evidence to support or refute the claims of a particular party, long before anyone reaches court.
Electrostatic detection apparatus: reading the paper’s secrets Where the VSC highlights colour differences, ESDA reveals hidden impressions. Writing on the top sheet of a pad leaves shallow indentations on the pages below. ESDA charges the questioned page electrostatically, dusts it with fine toner, and
VSC and ESDA are complementary tools in forensic document examination: VSC detects changes in colour or composition, while ESDA reveals erased or latent writing impressions. Both techniques produce objective visual evidence suitable for presentation to clients, juries and judges. Solicitors and small business owners do not need these machines on site, but they do need awareness. If a document feels “not quite right”, halt the paper trail, protect the original document from further handling and seek advice from a forensic expert. Early intervention is almost always more cost-effective than reactive litigation.
Final thought As methods of forgery evolve, so does the need for careful, informed analysis. Forensic document examiners combine experience with technology to detect subtle details - differences in signatures and handwriting, ink or marks left on the paper, anomalies in physical properties such as staple holes – that might otherwise go unnoticed. Their role is to interpret these findings clearly, helping clients and courts look beyond appearances and assess the integrity of a document.