In 1839 Hullmandel
used his increasing skill in printing graduated colours to produce
one of the finest examples of colour lithography, Thomas Shotter
Boys' Picturesque Architecture in Paris, Ghent, Antwerp, Rouen.
Boys (1803-74) was a watercolour artist who developed an interest
in lithography, achieving remarkably subtle effects with his careful
use of different tints. In the preface he notes that these were
quite different from the opaque colours and unvarying intensity
of hues used by others for 'mere decorative subjects' - seemingly
a reference to the quite different work of Owen Jones.