Yea, they always tapped black walnuts as well as Maple and boiled it separate (or at least they said so). I don't remember much of a difference between the 2 but we are talking 40 years ago and about of bunch of then mid-40's guys who knew more about logging, building fires and fermented beverages than just about anything else when gathered together.
Shoot, I can still hear the barrel of homemade sauerkraut gurgling in the basement - them dudes liked "projects".
