Here you can compare recent 1800s ink, with the ancient iron gall ink. Look carefully for the 1400 years acidic action, eating into the parchment by the ancient ink.
The supposed CPamph corrector (a theory with lots of problems) would make the writing c. 600 AD.
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Also note the severe yellowing and oxidation and gelatination !! Caution in handling. This is the result of the parchment being in the hot desert sands for those many centuries. All dried out and brittle. It almost crumples to the touch, so, like many ancient manuscripts, the pages are not to be turned except for very special reasons, for concern of damage.
