SFIV1967
Venerated Member
Is that more visible from one angle than the other?
I have copied this good explanation from the acouticguitarforum:
"Runout is the angle that the fibres of the wood ("grain") make with the face of the cut lumber. This is seen from the side of the board, not the end. In the figure, below, the "rising grain" shown, if sliced in half, book matched, will result, when the two slices are opened like pages of a book, in one slice having "rising grain" while the other slice will have "falling grain", oriented the opposite direction. The reflection of light from the two orientations of the fibres of the wood result in one side appearing darker than the other. If you reverse the guitar end-to-end, the lighter and darker sides reverse. It has to do with how the light reflects from the surfaces having different orientation of the fibres."
Ralf