Appendix G: Reference Plate
Your instrument may be supplied with a 2”x2” White Reference Plate designed to be
used as the reference material for reflectance scans. The plate is made of
polytetrafluoroethlyene (PTFE) and has high diffuse reflectance.
Over time the surface of the plate may become dirty or scratched. In order to restore the
plate to its original properties, it can be cleaned by sanding the PTFE material under
running water with a 220-240 grit waterproof emery cloth until the surface is totally
hydrophobic (water beads and runs off immediately). Sanding should be done gently, in
a figure-8 motion, rinsing away the sanded off layer as you go. When complete, dry the
surface by blowing nitrogen or clean compressed air over the surface.
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