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Beige stain on 93r

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• Beige stain on 93r

• RE: Beige stain on 93r

  Stefan Wirtz_2 > Yesterday, 11:55 AM

  Looks like any kind of later water damage.

• RE: Beige stain on 93r

  Jorge_Stolfi > Yesterday, 01:22 PM

  (Yesterday, 11:55 AM)Stefan Wirtz_2 Wrote: You are not allowed to view links. Register or Login to view.Looks like any kind of later water damage.

  
  Well, the "coffee" stain has exactly the same color as the "flower".  Even on the multispectral scans.  For example, it is as dark as the leaves under UV and blue, lighter under amber and red, and nearly invisible under 870 and 940 nm infrared (whereas the leaves are still dark). As expected from ocher paint.
  
  Or are you referring to the water stain on the top margin (J,K)? Yes, that one could be just a water stain from any other time.
  
  All the best, --stolfi.

• RE: Beige stain on 93r

  Jorge_Stolfi > Yesterday, 01:32 PM

  (01-12-2025, 11:41 PM)ReneZ Wrote: You are not allowed to view links. Register or Login to view.The paint would tend to form puddles, basically 'lie' on top of the parchment and take forever to be absorbed by the parchment, let alone get dry.

  In general, paints and painting techniques that work on paper should not do well on vellum.
  
  When paint and ink are applied to paper, they flow into it and get trapped by the fibers.  That provides some resistance against abrasion and humidity. And that is why lampbrack (china, india) ink is the best ink for paper.
  
  But parchment is not supposed to absorb paints and ink like that.  Lampblack ink would just sit on top of the parchment and would be easily rubbed off. That is why writing on vellum only makes sense with iron-gall ink: because as it oxidizes it turns into an insoluble polymer that is chemically bound to the proteins in the vellum.
  
  All the best, --stolfi
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