SVEZA Interior and Exterior Plywood grades Defects Part 36: Wood structure defects (bud traces)
Bud traces are traces of dormant buds that failed to develop into sprouts. Bud traces diameter does not exceed 5 mm.
Dark bud traces are considerably darker than surrounding wood.
Light bud traces are of the similar color to the surrounding wood.
Congested bud traces are three and more ones located within 10 mm from each other.