Monthly Archives: October 2013

Flying through the Bressingham Roll

To get some idea of the internal structure of the Bressingham Roll, it was instructive to generate a fly-though animation. This peels away the scroll, layer by layer showing what is underneath various layers of parchment and how they are stuck together (if they are).

The videos below show two different “cuts” though the roll. The first is parallel to the long axis of the roll. The second is across the long axis of the roll – equivalent to making slices of a Swiss roll.

In this video, you can make out some writing – in places the ink was clear enough to give a good X-Ray contrast with minimal post-processing needed to make it visible.

You can see some dark marks on the parchment in this video, some of these are ink, others are some other material in the roll that is also showing up strongly in X-Rays. It’s much harder to recognise the writing in this view, because it isn’t presented to you in the usual format you see it.

Introducing the Bressingham Roll

As part of our continuing collaboration with the Norfolk Record Office, we’ve recently been lent a parchment roll from a bundle in their archives (Call number PHI468,577X9)

The Bressingham Roll as open as possible. The section to the right of the image is stuck together.
The Bressingham Roll as open as possible. The section to the right of the image is stuck together.

The Bressingham Roll as unrolled as possible. The section to the right of the image is stuck together.

The roll is unfit for production in the archives, with the inner portion becoming stuck together.

End view of the parchment roll in rolled up-state.
End view of the parchment roll in rolled up-state.

The ink used in the writing contains both iron and copper, so should have good contrast in X-Ray imaging.

Bressingham Roll – Initial Results

Soon after the Bressingham Scroll arrived, we performed a quick test CT scan to determine the settings needed so we could image both the parchment and any ink on it.

A single slice of the scan is shown here, the ink shows up as brighter patches on the whirls of the parchment.

The end-on single slice view of Bressingham roll shows both the parchment and evidence of ink very clearly.
The end-on single slice view of Bressingham roll shows both the parchment and evidence of ink very clearly.

This was imaged at 30kV with a 200um Al filter and post-processing with in-house developed beam hardening correction software.