Public domain photos

The image shows a close up of a piece of wood with a ruler next to it, and on the surface of the wood there is some text and an arrow mark. The text reads "medulla k+ yellow" and the arrow mark indicates that the wood is naturally yellow.

The image shows a close up of a piece of wood with a ruler next to it, and on the surface of the wood there is some text and an arrow mark. The text reads "medulla k+ yellow" and the arrow mark indicates that the wood is naturally yellow.Open in library