Napoleonic Artillery
The colours of the Napoleonic guns is a rather obscure topics, only interesting for military enthusiasts, historians, wargamers and ... chemists like me, and like Stephen Summerfield, a succesful author of many Napoleonic books (you can watch the Stephen's academic profile at the Academia site) and habitual contributor to the Napoleon-Series site where is the editor of the Smoothbore Ordnance Journal.
The reason behind this digression was the search for the colour of Napoleonic Polish guns (prompted by a friend). I suddenly remembered a book on this subject, Napoleonic Artillery (The Crowood Press Ltd. 2007) by Anthony L. Dawson, Paul L. Dawson and Stephen Summerfield, standing in my bookshelves.
The required information is in the Table 9.2 on p. 229 (and it is not reproduced here to avoid copyright infringement) at the Chapter 9 'The Colours of Artillery Pieces'. The full chapter 9 spans pages 226-231, and it seems written by a chemist, so I suppose Stephen was the responsible of that interesting information.
In addition to the above information, the book is packed with a mine of information about the subject so it is a must for the napoleonic wargamer.
Incidentally, the woodwork of the Napoleonic Polish guns was painted 'mainly blue-grey' with black metal fittings.