I must agree with VViews that the thick blue is generally very messy and shows patches of various different colors. It might even mean that other colors have been overpainted with it, as has been suggested.
And also, of course, on the fact that we don't know who made the scratches, when, how and why.
There is something peculiar about the ones on the plant root though, now that I look back at them. Have a look at the "outlines" of the lines:
Made when the ink was still wet, or does it look like this because of the surface of the parchment? In the first case, it would at least imply that the scratching was done together with the application of the strange dark paint.
(JKP is there anything you can't do?)
And also, of course, on the fact that we don't know who made the scratches, when, how and why.
There is something peculiar about the ones on the plant root though, now that I look back at them. Have a look at the "outlines" of the lines:
Made when the ink was still wet, or does it look like this because of the surface of the parchment? In the first case, it would at least imply that the scratching was done together with the application of the strange dark paint.
(JKP is there anything you can't do?)