RECORDING FLUID FOR NEAR-INFRARED READING, RECORDING METHOD USING THE SAME, AND METHOD FOR READING INFORMATION WITH NEAR-INFRARED RAY

摘要

PURPOSE: To obtain a recording fluid for near-infrared reading which absorbs near-infrared rays well, dissolves well in a solvent, and is excellent in print density and resistances to light and water. ;CONSTITUTION: The fluid contains an aq. medium and at least one coloring matter of which the free acid form is represented by the formula (wherein A and C are each an optionally substd. phenyl or naphthyl group; B is an optionally substd. phenylene or naphthylene group; and n is 0 or 1).;COPYRIGHT: (C)1995,JPO