You know, I've really not found it to be that "unpredictable". :idunno:
Sugar maple colors a more orangey brown color. Red maple (which I generally avoid) turns a more brown brown color.
If you want to build an 18th/19th century flintlock rifle that actually looks like an 18th/19th century flintlock rifle, you use Aqua Fortis. :wink:
I have tried "Vinegaroon" on maple, but for me, THAT is the real unpredictable stuff. I've always had HORRIBLE results with vinegaroon anyway when trying to color leather... why would wood do any different??? :haha: Last year, I FINALLY got a batch of vinegaroon that would color maple an aqua-fortis-y sort of color. Didn't look bad. Sort of dull, and not nearly as clear and bright as A.F., but ok. Well, it sat in my shop and froze during the winter. After that, it made a funky purplish brown color. So I make up a new jar full. Again, funky purple. So I have quit fooling with it entirely.