A humidity-sensing material based on C-60 is described whose conductivity is mediated by the amount of water vapor to which it is exposed. Its response is quick enough to follow the breathing of a person from a distance of 30 cm. The characterization of the material by DC polarization, AC admittance, and near-IR photoacoustic response measurements as well as UV-vis spectra is reported and the preparation of both bulk and thin-film specimens described. Work to resolve the composition and the sensing mechanism of the material in more detail is in progress.