This is from an environmental tapelift collected in a school classroom. The yellow particle just to the upper
right of the center of this image is from the yellow paint on the surface of the pencil. The vehicle of this paint is acetone soluble so the
acetone soak in preparing this tapelift for analysis dissolved the vehicle and the paint pigment and filler coalesced into an ellipsoid due
to surface tension. The black particles that show the light tan highlights are from the pencil lead. A small sawdust particle is left of
center (white elongated particle) in this image.
Transmitted Off Circular Polarized Light and Reflected Darkfield Illumination
Pencil debris includes the carbon fragments from the "lead" of the pencil, wood sawdust, and paint from
the surface of the pencil. The carbon fragments are actually a blend of clay and graphite.
Significance in the Environment:
Graphite is relatively reflective and so the particles from the pencil lead are speckled when viewed
with reflected light.