MikeG.
Established Member
I mentioned this issue in another post, so I thought I would see if anyone can help with an explanation. Sometimes with kiln dried oak there can be patches of a really quite distinct yellow stain on the surface. I'm seeing it more recently, but as yet only in American white oak. The explanation I have heard is that it is associated with over-cooked timber (ie a kiln that was too hot and dry, drying the timber too fast), but I am intrigued as to what is actually going on. What is it that turns yellow, and why?