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Grease pencil marks do not disappear when the electricity fails , as it most surely will despite any number of backups . The effect disappears when a magnetic field is applied , which clearly establishes the magnetic nature of the effect . Its chances of ever becoming a major centre disappeared when the Toowoomba - Warwick railway bypassed the town . The conflict of interest disappears when the workers are the owners . Second , even in forms of drama based on written scripts such as those of Shakespeare 's plays , the script disappears when the play is performed . Session cookies are normally set with the latter expiration date , forcing them to disappear when the user quits from the browser . There are two types : fluorescence - stimulation of light emission by an energy source which disappears when the energy source is removed . Zorba disappeared when the plot failed , and his final reign as a crime lord was short-lived indeed . If no expiration date is mentioned , the cookie should disappear when the user exits from the browser . The torus disappears when the bolometric luminosity decreases below 10 ergs because the accretion onto the central black hole can no longer sustain the required cloud outflow rate . The sequence of photographs above shows that when light is reflected through a small angle to the viewer 's eyes , brilliant blues are seen , but they disappear when the light source is moved away from the viewer . The hyperalgesia and myoclonus disappeared when the morphine administration was discontinued and she felt comfortable on small and sporadic oral doses of methadone . Both bands disappeared when the antibody was preadsorbed to the antigenic peptide ( Figure 5E , lower panel ) . A further example is the switch that occurs when unconsolidated accounts are consolidated , an event that normally occurs after a merger or take-over ; a loan from one entity to another disappears when the balance sheets of two separate units are consolidated . The XRD spots , including the topograph , disappeared when the x-ray beam passed through only molten N5 . That is , show the linked object while the user is activating the link , and make it disappear when the user releases activation .