Out of interest, what WAS the lowest colour you found? Austin 10 Drivers club mapped their colours against the Belco charts, giving the best matches. It would be good if someone has actually got a match for the Turquoise scan in the collection. Sadly it's not as frequently used as other colours across the Austins.
This is the 1936 swatches and is probably almost good enough for taking a scan to compare against the Association record Dave has posted.
This is the 1936 swatches and is probably almost good enough for taking a scan to compare against the Association record Dave has posted.