Description
Graphite is one of the most optically complex materials in common use — its layered hexagonal crystal structure produces anisotropic reflectance that changes dramatically with viewing and lighting angle, simultaneously appearing as a mirror-like specular surface and a matte grey powder depending on the relative orientation. This image was made at 5:1 reproduction using a microscope objective adapted to a mirrorless camera body, with raking illumination at 5 degrees from the graphite plane to maximise the three-dimensional relief of the crystal surface. The 9B pencil tip — the softest and most graphite-rich grade — shows the characteristic large graphite platelets of a soft grade, the surface topography showing flake edges and step features of approximately 1 micron height. The sharpened cone geometry tapers to a visible point of approximately 30 microns, the entire geometry of the sharpening process readable in the surface marks left by the sharpening blade.
