19-11-2025, 02:05 PM
You yourself say that the colour tone changes constantly. Therefore, a later change or addition is virtually impossible.
Example image.
The pages are next to each other. Nevertheless, you can see that two different inks were used.
You can't tell me that space was left to insert text later with red ink. Nevertheless, I have the same red on both pages but different writing ink. Now it is very likely that the darker ink was also used to insert corrections and additions. Example: crowns.
This happened in quick succession. Probably around 1438-40. The crown is the key. From king to emperor.
Translated with DeepL.com (free version)

