Spitzer mid-IR spectrum of the PN Tc 1 (black line) compared with the best photoionization model spectrum including HAC-like dust grains (green line). The C₆₀ (vertical dashed blue line) and C₇₀ (vertical dashed red line) emission bands and UIR plateau emission features are indicated. We note that the narrow emission features seen in the best model spectrum (green) are just atomic nebular emission lines, whose detailed modeling is out of the scope of the present work.