Valonia
From London's Ghost Acres
The cup of an acorn from a species of oak tree, used in the tanning process of converting animals skins and hides into leather (Watt 1885, 81).
https://books.google.ca/books?id=2fMHAAAAQAAJ&dq=leather%20manufacture&pg=PA81#v=onepage&q&f=false
Imported from