The best material for a shim is a thin piece of maple veneer. Most bolt-on necks are made of maple, so it makes sense to make a shim from the same material. The wood can be easily shaped to fit the neck pocket and angled to the proper degree. I typically start with a piece of maple about .060 thick.
Lignin is a class of complex organic polymers that form important structural materials in the support tissues of vascular plants and some algae.[1] Lignins are particularly important in the formation of cell walls, especially in wood and bark, because they lend rigidity and do not rot easily.
melanin (melÂ´Énin), n the dark amorphous pigment of melanotic tumors, skin, oral mucosa, hair, choroid coat of the eye, and substantia nigra of the brain. a dark, sulfur-containing pigment normally found in the hair, skin, ciliary body, choroid of the eye, pigment layer of the retina, and certain nerve cells.