| Reference number | MS/33 |
| Level | SubFonds |
| Title | Essai d'une Classification des Couleurs by Johann Ferdinand Opiz |
| Creator | Opiz, J. F. |
| Description | The essay has no text but is simply a colour chart. The letter is in French and is dated Tschaslau (en Boheme) 8 March 1791. There is an engraved portrait of the author, which is by Berka of Prague, 1791, and a letter from him to the Royal Society |
| Language | French |
| Extent | 1 volume, MS small |
| Physical description | Paper, bound, size 9 x 6.75 inches, 9 ff |
| Access status | Open |