Non Commercial Printing Methods
- Created by: s013693b
- Created on: 08-05-14 22:12
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- Non Commercial Printing Methods
- Type Script
- Not used anymore, old documents
- Similar to letter press
- Poorly defined edges
- Defects from physical damage
- Dot Matrix Printers
- Becoming obsolete
- Pins impact into inked ribbon
- Individual dots not always visible under microscope
- Stepping on diagonals
- Impressions on paper from physical impact
- Inkjet Printers
- Liquid ink ejected from nozzle
- Characters formed by series of over lapping dots
- Colours mixed from these colours
- C (Cyan)
- Y (Yellow)
- M (Magenta)
- Colour components visible under microscope
- No impressions on paper
- Satellite dots
- Laser Printing/ Photocoping
- Method
- 2. Charge removed by laser on non print areas
- 4. Transferred to paper and fused by heat/ pressure
- Solid characters , raised above surface- glossy appearance
- No impressions on paper
- Photocopy
- Gripper marks
- Speckled appearance
- Damage to drum
- Chips and dirt on glass
- Method
- Pens
- Ballpoint
- Striations, rapid movements, lower ink density on parts of ink line
- Roller Ball Pen
- Ink density greater and more uniform
- Fibre tip pen
- Variable ink density especially on the up stroke. Rapid movement- width variation
- Fountain pen
- Diffusion of ink seen under microscope
- Pencil
- Not commonly encountered in document analysis
- Irregularities in surface of the paper-dry writing method
- Ballpoint
- Paper
- Wood Pulp (West)
- Grass Pulp (Africa)
- Sizing agent fills gaps between fibres
- Wood Pulp (West)
- Sizing agent fills gaps between fibres
- Optical brightness added 1950- Fluorescence under UV
- Fluorescent fibres added to non florescent paper, usually seen on important documents such as MOT certificates, currency etc
- Type Script
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