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“This colour ultraviolet image of the burnt copy of Magna Carta reveals whole sections of text which are otherwise invisible to the naked eye.” (via Revealing the secrets of the burnt Magna Carta - The British Library)

While there is evidence of shrinkage and discoloration of the parchment on the Canterbury Magna Carta, we know that much of the ink was still legible after the fire as a near-perfect facsimile was produced in 1733. The current poor condition of the manuscript is largely a result of conservation techniques used by British Museum Library staff in the 1830s in a restoration attempt. The manuscript was most likely flattened and treated with chemicals which, it was thought, would improve the manuscript’s condition. Unfortunately, these techniques rendered the text almost completely illegible. Some words can be seen with the naked eye, especially towards the bottom of the charter, but even then they are significantly degraded. The British Library therefore undertook multispectral imaging of this document in 2014, to determine whether more of its medieval handwriting could be recovered.