An afterglow may appear above the highest clouds in the hour of fading twilight or be reflected off high snowfields in mountain regions long after sunset. The particles produce a scattering effect upon the component parts of white light. The opposite of an afterglow is a foreglow, which occurs before sunrise.
<em>afterglow occurs after the comedown. Afterglow slowly fades, but can last as short as 24-hours, while some positive post-acute phase of psychedelic drug effects </em><em> have been reported to extend between 6 and 8 weeks</em><em>.</em>
