"Over the years a prejudice has developed against the heartwood of hickory. Red hickory (heartwood) is often placed in a lower grade than white hickory (sapwood) simply because of its color. Tests by the Forest Products Laboratory have shown conclusively that red, white, and mixed red-and-white hickory have the same strength characteristics, regardless of color. The negative attitude toward red hickory developed during the days of virgin hickory stands. Under virgin-stand conditions the heartwood was often less dense and not as strong as the sapwood. In the second-growth stands of today this density difference does not exist, and specifications and utilization practices should be adjusted to take this fact into account."