DOCUMENT CAPABLE F CHECKING TRUE OR FALSE

摘要

PURPOSE:To make it possible to check authenticity of a document such as bill and credit card. CONSTITUTION:A document has an authenticity checking area where conductive material having magnetic property different from non-conductive material with respect to microwave is distributed on at least a part of the document made of the non-conductive material. The conductive material is made of conductive layers of continuous mesh which are distributed at random on the checking area ranging over many auxiliary areas. For the conductive layer of continuous mesh, a layer having a metal thin film treated by vapor phase method on mesh of a continuous mesh sheet consisting of pulp or plastic is most suitable. Thus, a document having excellent measurement sensitivity at checking true and false by the microwave can be obtained, so that authenticity can be determined correctly.