  The fast, dense winds which characterize Wolf-Rayet (WR) stars obscure
  their underlying cores, and complicate the verification of evolving
  core and nucleosynthesis models. Core evolution can be probed by
  measuring abundances of wind-borne nuclear processed elements,
  partially overcoming this limitation. Using ground-based mid-infrared
  spectroscopy and the 12.81um [NeII] emission line measured in
  four Galactic WR stars, we estimate neon abundances and compare to
  long-standing predictions from evolved-core models. For the WC star
  WR121, this abundance is found to be >~11x the cosmic
  value, in good agreement with predictions. For the three less-evolved
  WN stars, little neon enhancement above cosmic values is measured, as
  expected. We discuss the impact of clumping in WR winds on this
  measurement, and the promise of using metal abundance ratios to
  eliminate sensitivity to wind density and ionization structure.
