2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/94911The ultraviolet energy distribution of quasars shows a sharp steepening of the continuum shortward of 1000 A (rest-frame). We describe how we came to consider the possibility that this continuum break might be the result of absorption by carbon crystallite dust grains.Proceedings of Ninth Texas-Mexico Conference on Astrophysics, San Antonio, to appear in RevMex Conf SeriesAstrophysicstext