When the knotting process is completed, the rugs are washed, then reinspected. Rugs frequently receive a second chemical “lusterizing” wash to protect their rich sheen and subtle color tones. After washing, the rugs undergo a trimming process that assures that the surface is uniform and that the pattern is clearly defined according to the design. In some cases, rugs are also “carved” by specialists to give the patterns a dimensional effect.