[split] Jorge's Retracer Thread: darker ink, retracing of text and drawings

[Jorge_Stolfi]

It's not just the same ink, it's probably also the same nib and the same cut.

The nib of a quill pen had to be trimmed to a specific shape (tip squared-off, with a ~45 taper on the underside) and slit in half.  Like fountain pens and steel pens, to this day.  The slit is essential to ensure the proper flow of ink to the tip from the drop stored up in the qull/pen/reservoir. 
   
So both lines highlighted on that image were written in shades of brown using pens with slits and squared-off tips.  That is all the resemblance we can see.  None of that counts as evidence that it was the same scribe.