Spalting is caused by moisture and fungus incursion in a tree, sometimes called “Ambrosia Maple”. We learned years ago that we could take a maple log, leave it in the woods and dowse it with beer to hasten the fungus, the yeast in the beer being the active agent.
![Maple Burl Closed Vessel](https://caseworksart.com/wp-content/uploads/2022/02/Turning-9.jpg)