| 摘要 |
<p>PURPOSE:Title ink that is produced by mixing a fluorescent substance with specific performance and a low-viscosity of mineral oil or drying oil, thus facilitating optical reading. CONSTITUTION:(A) A fluorescent substance that emits other light different in wave length when infrared light is irradiated, a compound of the formula (A is Bi, Ce, Ga, Gd, In, La, Lu, Sb, Y; 0.05=X=0.98; 0.02=y=0.95), (B) a low-viscosity mineral oil or drying oil and, preferably (C) pigments or dyes are combined. For example, infrared beams are irradiated from the source 3 onto ink 2 transferred paper 1 and only emitted infrared light is read through filter 4 that can remove the irradiated infrared beams only, thus eliminating the troubles caused by misreading the stains or something like that on the paper.</p> |
