real walnut stain. We have a bunch of Black Walnut trees on our property.. I think 20 or so.. (and about 10 buckeye trees, maple and some assorted other trees.) I picked up a walnut "fruit" looks like a lumpy green apple, and pealed it open for the heck of it.. it bled dark yellow all over me, it was incredibly juicy, and I thought, hmm.. that might make great natural dye.... (yep... this was a duh kind of thing) I went inside washed the yellow from my hands til i could see no more.....and forgot about it.
... now my fingers are brown anyway.