Because young comets often have a complex mantle of dust grains that they have swept up over millions of years and during the first passage around the Sun, the comet has to shed much of this dirty mantle before the brighter ices can be exposed. As an example, the upcoming Comet Hale-Bopp now appears to be actively shedding its dusty mantle, which is being ejected into space as the carbon dioxide ices sublimate into gas and produce powerful plumes of gas. The comet is brightening noticeably and in its spectacular apparition next year, this dust shedding event may make this comet brighter than it would have been otherwise with a thick dust mantle in place.