The process is pretty simple-
I started with a 5 gallon pail of walnuts some with hulls and some without.
(mine sat for a month at least)
Took off lid-it was kind of gross!
I did the heating in the mill-
Yucky walnut mixture heating in the dye pot (60 minutes after it comes to boil)
Yep, I stuck my yarn in there after I strained the walnut mixture. After 90 minutes with heat, I turned it off and let it sit overnight.
Lucky me, you get to use it, more than once.