  The Optical Gravitational Lensing Experiment identified over 1,800
carbon-rich Mira and semi-regular variables in the Small Magellanic Cloud.
Multi-epoch infrared photometry reveals that the semi-regulars and Miras follow
different sequences in color-color space when using colors sensitive to
molecular absorption bands. The dustiest Miras have the strongest pulsation
amplitudes and longest periods. Efforts to determine bolometric magnitudes
reveal possible systematic errors with published bolometric corrections.
