An improved two-stage separator uses reusable containers for collecting particles separated by each separation stage. The portion of the video is less than an entire screen of the video such that at least some of the video is still visible. The chemical compositions of each stream are stored and updated in a plant wide database. The black dye mixture is advantageously used for ink jet printing and provides high light-resisting and neutral black ink formulations. The treating fluid may further comprise a lower n-alcohol for improved temperature stability. Therefore, the insertion slot can be made wider to facilitate the insertion of an electric card and prevent the phenomenon that the electric card cannot be inserted into the insertion slot due to the deformation of the insertion slot.