| RefNo | CLP/24/41 |
| Level | Item |
| Title | Instructions, 'Advice about a concealed way of writing' by Henry Oldenburgh [Oldenburg] |
| Date | 17th century |
| Description | Oldenburgh provides instructions on how to conceal messages. Notes the ingredients and method required to create a white ink, with which to write the 'secret' lines; a black ink, with which to cover up those lines, and; a substance with which to blot out the black ink and make the former lines visible.
Subject: Chemistry |
| Extent | 1p |
| Format | Manuscript |
| PhysicalDescription | Ink on paper |
| Digital images | View item on Science in the Making |
| AccessStatus | Open |
Fellows associated with this archive
| Code | PersonName | Dates |
| NA8001 | Oldenburg; Henry (c1619 - 1677); scientific correspondent | c 1619 - 1677 |