Whittock, Nathaniel: The Art Of Drawing And Colouring From Nature, Flowers, Fruit, And Shells: To Which Is Added, Correct Directions For Preparing The Most Brilliant Colours For Painting On Velvet, With The Mode Of Using Them, Also The New Method Of Oriental Tinting ; With Plain And Coloured Drawings (London, 1829)

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strong gum water, which will render them transparent, and at the
same time darken the shade.

LESSON XIV.
GRAPES.

This fine bunch of Lisbon grapes will be easily executed by the
student who has finished the currants successfully. No directions will
be required for drawing them; and it will be seen by the pattern that
the strong light is the first tint laid over the whole surface. It is
a very light tint of Prussian blue and lake. These colours, worked in
various degrees of strength, are all that are required in this subject.
The strong light touch, on the centre of the fruit, must be pre-
served with care; and it will greatly heighten the effect if a touch of
indigo and lake, rubbed up in gum water, is made immediately under
the light spot.

a