Recipe: Take a tile that has not been cooked too much, grind it and diluted it in white wine with burnt black trasse paper. If you add burnt horse manure to it, it will be all the better. Moisten with egg white.
at left bottom margin of folio 083r
Trasse paper burnt under a light fire becomes akin to soft black charcoal. It molds nealty and is removed easily when mixed with the others ingredients or sands?.