| 摘要 |
<p>PURPOSE:To provide the title ink which has an absorption in the infrared region but not in the visible region and to provide a print of classified information which is machine-readable under infrared light without an unnaturally colored design unlike the conventional one by using the ink. CONSTITUTION:The title ink comprises a powdered phosphate glass containing phosphorus pentaoxide as the principal component and at least 1.0wt.% iron oxide and/or copper oxide, a binder and a solvent. The title print comprises a substrate which reflects infrared light and a printed image comprising the ink and formed on the substrate to form a pattern.</p> |
