| 摘要 |
PROBLEM TO BE SOLVED: To provide an ink for scratch-printing, capable of holding a concealing property against the light of a specific light source, e.g., black light, simple in the constitution, producible in a few steps and easy to produce, and to provide scratch-printed matter. SOLUTION: This ink for scratch-printing contains a substance having, in an ink base agent for offset-printing, a wider band gap than that of the energy of irradiation light, e.g., a substance having a band gap of >4.1 eV and≤20 eV, or a substance having a band gap of >4.88 eV and≤20 eV. Concretely, as such substances, magnesium oxide, tantalum oxide, calcium oxide, lithium fluoride and sodium chloride are suitable. The scratch-printed matter 10 is provided by applying the ink for scratch-printing onto a printing substrate material and installing a printing layer 13 for forming concealed characters 12 as a concealed image. COPYRIGHT: (C)2013,JPO&INPIT |
