Hidden notes of the VMs

[Searcher]

Could it have been another (presumably ignored) instruction to the painter, in Latin this time?   Terra atra was seen in couple of colour names for painters' pigments, e.g. terra atra veneta [page 297 You are not allowed to view links. Register or Login to view.], although I don't know if that was also the case during the manuscript's dating range.

I think everything is possible, although, on my view, it would be strange to write such an instruction with bold capital letters.