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

102 SUNSET.

appear warmer, by the opposition of positive
purple shadows, while tho'se objects which do
not receive any of the sun's light are kept very
cool grey, (the effect of reflected light from
the blue sky) which by contrast throws the
whole of the illuminated part of the picture
into warmth. Frontispiece.