Based on modern analysis, it has been determined that a quill pen and iron gall ink were used for the text and figure outlines; the colored paint was applied (somewhat crudely) to the figures, possibly at a later date.
A quill pen and iron gall ink were used for the text and figure outlines. It has been determined this. This was based on modern analysis. The colored paint was applied (somewhat crudely) to the figures at a later date. This was possibly.