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The concrete evidence adduced to support the widely held idea thatunidentified infrared bands (UIBs) are enhanced in carbon-rich planetarynebulae (PNe) is a remarkable UIB 7.7 {\mu}m versus C/O ratio correlation plotfor six PNe, obtained from air-born observations and published in 1986 by M.Cohen and coworkers. However, the space-born data presented by Cohen & Barlowin 2005 undercut this correlation, and I show that the larger dataset theyprovide disproves a specific link between UIBs and carbon abundance in PNe. Italso follows from these data that interstellar UIB carriers cannot originatefrom the atmosphere of carbon-rich PNe.

Unidentified infrared bands do not correlate with C/O ratio in planetary nebulae