Image: Hidden watermark
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Description: An electron micrograph of a hidden watermark on CCD filter from 1976. The watermark is a latin inscription naming the researchers and their supervisor and the year: Carolus Paulusque fecit Vanna pinxit Anno Domini MCMLXXVI GC. Lecchi Pontifex Maximus. Image kindly donated by prof. Giuseppe Ferla.
Title: Hidden watermark
Credit: Own work
Author: Squidonius
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: https://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes
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