Relationships in Black Walnut Heartwood Between Color and Other Physical and Anatomical Characteristics

Relationships in black walnut heartwood between color and specific gravity, extractive content, and anatomical characteristics were explored. Per cent luminance, color brightness, was significantly related to extractive content and to the combination of extractive content and some of the measures of wood density. It was found that trees from Indiana compared with those from Missouri differed significantly in the following wood characteristics: lower extractive content, higher proportion of fibrous tissue with thinner cell walls, and smaller vessel lumens