Yes, thank you, I know. I wrote the only (to my knowledge) treatise on "Vellum Preparation. History and Technique." Your friend is letting their common sense of craft take a back seat to their need for academic legitimation. Seen it a million times. And it's sad.

Ok, I understand what you want to say, but in this case I don't share this opinion. That's not a problem. Thanks for the conversation.