HOW VOYNICH WAS WRITTEN

[-JKP-]

From the forensic department.
When someone writes normally on the right hand, from left to right, and suddenly from right to left, it leaves traces.
If one person did that, it would certainly be possible, but not several.

If a draft were written first (e.g., from right to left) and then a final copy (from left to right), then those traces would not affect the final copy.