Howard, Frank: Colour, as a means of art: being an adaptation of the experience of professors to the practice of amateurs (London, 1838)

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CHAPTER II.

SECTION I.

CUYPS PRINCIPLE.

The simplest arrangement and treatment of Colours
will be found in the style of Cuyp and Both; objects
in shadow are relieved against a warm sunny sky.
For the reasons given in the Sketcher's Manual,
with regard to Progressive Execution, these are
the best adapted to beginners : objects in shadow
do not present much variety of tint.

The whole aspect or general tone of the picture
is warm. The shadows are cooler than the lights,