In 2017, the series takes its most recent step forward. Jim Stoddart has given his own 2007 design a new livery: the back covers, spines, Penguin roundel and cover text have all turned a pale blue-green, a shade known as ‘eau-de-nil’, ‘water of the Nile’. This colour is a reference to the series’ original palette and its brief blue-green incarnation as Twentieth-Century Classics.
The colour ‘eau-de-nil’ emerged in the late 19th century, associated with fashionable décor, clothing and ladies’ toilettes. Over the last hundred years it has become more peppermint, and is widely used by ‘classic’ brands including Fortnum and Mason, Laura Ashley and Hunter wellingtons. It resembles ‘Cambridge blue’.
(Henry Eliot, ‘Designing Penguin Modern Classics (Part 3)’)