From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Chart of six numbered paint swatches in various shades of yellow and brown, with their handwritten pigment compositions.
| Identifier | WestWitteringFiles\C\May1919\ Scan10 | |
| Date | 19th May 1919 guessed | |
| 3. Orange 6. Black Or. Van B. Tints & Vermillion 4. Black Orange & Van Brown 7. As above but diff mixture 5. Black, Orange, Van B & Red Brn 8. Black & Orange MBrown & Tints Brown | ||