The new ESDA² - outstanding technology with improved design

• more sensitive than oblique lighting
• simple to operate
• produces permanent 1 to 1 transparencies
• responds only to indented writing - ignores visible script
• non-destructive - leaves documents uncontaminated

ESDA is the leading technology for detecting indented writing on questioned documents. ESDA works by creating an invisible electrostatic image of indented writing, which is then visualised by the application of charge sensitive toners. The sensitive imaging process reacts to sites of microscopic damage to fibres at the surface of a document, which have been created by abrasive interaction with overlying surfaces during the act of handwriting.

• A new image development system
  Traditionally, cascade developers have been used in the image development process but ESDA² is supplied with a new system - the Toner Pad – a technique that ensures a cleaner operation while maintaining excellent sensitivity. A soft, brushed-textile pad, impregnated with toner is simply wiped across the surface of the imaging film to produce visible images of any indented writing. The new system is cleaner to use, removes the need to handle loose powder and eliminates the problems associated with under-or over-toned images. ESDA² retains the standard cascade developer, however, for those who prefer the traditional method of image development.
• New A3 vacuum bed with filter system
  The larger, removable vacuum bed and wider imaging film enable documents up to 310mm × 440mm to be processed and ESDA² also features a powerful extraction fan and filter to remove any airborne toner particles.
• Document preparation
  A new large capacity document humidifier is also provided, this increases the sensitivity of documents prior to the ESDA² electrostatic imaging process.
• Making a permanent record
  Images of indented writing can be made permanent by the simple process of laminating the developed images with the provided transparent self-adhesive plastic film.
• ESDA² – the complete system
  ESDA² is designed for examining all types of documents up to A3 size and is supplied with one reel of imaging film, cascade developer, 50 toner pads, a pack of fixing film and document humidifier.

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