Most physical mediumship is presented in a darkened or dimly lit room. The light coming from the diner illuminates a darkened and deserted urban streetscape. Daytime sky can be darkened to simulate night. Broken glass has sparkled in darkened streets. The shadow images eventually darkened all over. Some versions may be darkened with caramel, though high-quality oyster sauce is naturally dark. This had gradually darkened, making the already fading images even harder to see. They once darkened the skies of Xindus, the Xindi homeworld. The striped pattern was only visible over the darkened areas. Contamination with iron sulfate was greatly disliked as this darkened and dulled dye colours. It would have been darkened by exposure to sunlight. The lunar terminator is the boundary between the illuminated and darkened hemispheres. It featured a legion of people racing across a beach under a darkened sky. The result is a luminous rainbow that contrasts with the darkened background. Sun tanning or simply tanning is the process whereby skin color is darkened or tanned.