From Egyptian Secrets of Albertus Magnus, Joseph H. Peterson edition:
How to make the Genuine Forest Ointment for Healing Gangrene and other Sores.
Take symploearpus, forest manna, vernonica or speedwell, alsine pubescens, centifolium; press the sap from these herbs, then take white rosin or pitch, tallow and butter; render it down, add the sap and boil together; add five cents' worth of verdigris. This is the genuine forest salve.
The grimoire Egyptian Secrets of Albertus Magnus lists this spell.