  We present optical and infrared imaging and spectroscopy of the R Coronae
Borealis-type (R Cor Bor) star IRAS 00450+7401. Optical spectra further confirm
its classification as a cool R Cor Bor system, having a hydrogen-deficient
carbon star spectral sub-class of HdC5 or later. Mid-infrared spectroscopy
reveals the typical ~8 um ``hump'' seen in other R Cor Bor stars and no other
features. A modern-epoch spectral energy distribution shows bright emission
from hot dust having Tdust>600 K. Historical infrared data reveal generally
cooler dust color temperatures combined with long-term fading trends, but
provide no discernible correlation between flux level and temperature.
Investigating the most mid-infrared variable R Cor Bor stars found in IRAS,
AKARI, and WISE data reveals similar fading trends, bursts that can show a
factor of up to 10 change in flux density between epochs, and blackbody-fit
dust color temperatures that span 400-1300 K. While some R Cor Bor stars such
as IRAS 00450+7401 appear to undergo fade/burst cycles in the mid-infrared,
significant gaps in temporal coverage prevent conclusively identifying any
preferred timescale for their mid-infrared variability and circumstellar dust
temperature changes.
