Hair side, flesh side and Gregory's rule in the VMS

[nablator]

On some pages there are very visible traces of abrasion on one side: parallel groves that extend often over a large part of the page: they should be more visible on the flesh side, because the skin side is more fragile and needs less work. Also ink does not adhere as well on the rougher flesh side as it does on the smoother hair side: on some pages the difference is obvious.