File:Hidden watermark.jpg
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Hidden_watermark.jpg (570 × 458 pixels, file size: 86 KB, MIME type: image/jpeg)
Summary
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. Image kindly donated by prof. Giuseppe Ferla.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:43, 12 January 2017 | | 570 × 458 (86 KB) | 127.0.0.1 (talk) | 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. Image kindly donated by prof. Giuseppe Ferla. |
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