Cyanine dye based high saturation sympathetic ink having time delayed disappearance

摘要

Disclosed is an ink that is intensely colored in solution with the vehicle of the ink. The ink "disappears" or becomes invisible to the naked eye after a period of time has elapsed from the application of the ink to a record document. The ink being utilized to identify an unsatisfactory character on a document such as a MICR check which has had an erroneous character printed which must be corrected before being correctly machine read.