With this so-called Watermark Ink writing, the chips could also serve as secret code devices.
随着所谓的水印墨水的应用，这种晶片也可以用作为秘密代码设备。
2
A research team at Harvard analyzed the secret message, and, according to Lafferty's summary of its findings, it had never seen "sixteenth-century ink act as it does on that particular document."