  Massive colliding-wind binaries that host a Wolf-Rayet (WR) star present a
potentially important source of dust and chemical enrichment in the
interstellar medium (ISM). However, the chemical composition and survival of
dust formed from such systems is not well understood. The carbon-rich WR (WC)
binary WR~140 presents an ideal astrophysical laboratory for investigating
these questions given its well-defined orbital period and predictable
dust-formation episodes every 7.93 years around periastron passage. We present
observations from our Early Release Science program (ERS1349) with the James
Webb Space Telescope (JWST) Mid-Infrared Instrument (MIRI) Medium-Resolution
Spectrometer (MRS) and Imager that reveal the spectral and spatial signatures
of nested circumstellar dust shells around WR~140. MIRI MRS spectroscopy of the
second dust shell and Imager detections of over 17 shells formed throughout the
past $\gtrsim130$ years confirm the survival of carbonaceous dust grains from
WR~140 that are likely carriers of "unidentified infrared" (UIR)-band features
at 6.4 and 7.7 $\mu$m. The observations indicate that dust-forming WC binaries
can enrich the ISM with organic compounds and carbonaceous dust.
