Rockbadchild
Elite Member
I figured it was some early stage of rot and here what I found.I was splitting wood today and noticed a mustard color yellow in some of the wood. This is a red oak I think, probably a shingle oak. Anybody know what the yellow color is?
View attachment 838011
Yellow discolouration of European and American white oak might be caused by a fungi infection (paecilomyces variottii). This was shown by Professor Bauch in Germany in 1991. The discolouration only occurs in heartwood, though the fungi also live in sapwood. The actual colouring substance is assumed to be the result of some kind of reaction between the fungi and extractives naturally occurring in the heartwood.