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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The leaves os this flower are attached to the stem, by what, in
botanical language, are called petioles or sootstalks. This line runs
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through the centre os the leas, and determines the direction in which
the leaf is to appear when drawn. It would only be a repetition os the
directions in the last chapter to give a description os the way in which
the leaves of this group os flowers are sormed.
The disk or centre os each os the ssowers is coloured with a full tint
of gamboge ; the small spots are sormed with burnt sienna, dotted on
the gamboge ; the pink petals are coloured with lake; and the second
and third shades are made with stronger tints of the same colour ; sor
the very dark touches, a tint sormed os lake and indigo may be used.
The petals os the blue aster are coloured with a purple tint, sormed
with lake and prussian blue. They should each be sormed at one
touch with a large brush sull of colour, and sussered to get dry before
the next shade is applied. The second and third shades are sormed
with the same colours as the sirst tint, only made darker by adding
more blue. The darkest touches are made with indigo alone.
The leaves are put in light and shade with neutral tints. The
sront of the leaves are coloured with a warm green, made by mixing
prussian blue, gamboge, and a little indian red. The back os the
leaves is merely a saint wash of gamboge over the neutral tint. The
veins os the leaves are cut up with a dark green tint on the sront, or
neutral tint on the back. The saded leaves are tinted with burnt
umber.
The colour sor the calyx, or cup, that encloses the flower, is the
same as the leaves.