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Paper Reproduction Methods - Pros and Cons

  Tracing Rubbing Backlight Backlight-frontlight subtraction Ultraviolet Indirect ultraviolet (Dylux) Infrared X-Ray Betaradiography Surface laser scan
Reproduction quality low good good good good ? ? excellent excellent good
Equipment minimal minimal simple simple simple ? simple specialized specialized specialized
Costs minimal minimal low low moderate moderate moderate high high high
Health risks none
(although Briquet went blind copying watermarks)
none none none moderate moderate moderate radiation hazards radiation hazards moderate
Conservation issues - none
(in the reproduction and document are side by side)
- moderate
(if the tracing paper is on top of the original document and if this is fragile)
moderate
(contact between reproduction and document paper)
moderate
(document needs to be firmly fixed for reproduction)
moderate
(document needs to be firmly fixed for reproduction)
moderate
(document needs to be firmly fixed for reproduction)
moderate
(document needs to be firmly fixed for reproduction)
moderate
(document needs to be firmly fixed for reproduction)
low low moderate
(document needs to be firmly fixed for reproduction)
Library permission - none for side-by-side reproduction
- difficult for contact tracing
difficult difficult difficult difficult difficult difficult extremely difficult
(plus transportation permits needed for the radioactive plate)
extremely difficult
(plus transportation permits needed for the radioactive plate)
difficult
Other positive aspects   - objective reproduction of the sieve imprint                
Other negative aspects - reproduction is a subjective interpretation of the original
- image of a watermark may be the result of two or three folios within a manuscript or document [ please clarify this ]
  - to restaure aspect ratio, needs image registration - to restaure aspect ratio, needs image registration           - bulky hardware
- takes too much time for imaging in the present state of the technology
                     

-- FriederSchmidt - 22 Nov 2006

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