| 摘要 |
In at least an area for handwriting, a document has a primary printing which will exhibit evidence of attempts at erasure by a solvent or chemical eradicator for the printing ink used and a secondary printing which is at least partially erasable by the use of mechanical erasing means such as an india rubber. Preferably, the secondary printing overlies the primary printing and the two printings are of different configurations so that each of them can be recognized. |
