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n autokinetic phenomenon
Appearance of movement of a point of light when shown on a dark background.
n autolithography
A colour printing process where the artist creates his work on the plate itself as
opposed to using a photographic process.
a autumn
An adjective used in the fashion trade to describe those colours considered to
be appropriate for wear in autumn and in colour psychology to classify and
differentiate between certain colour tones in their appropriateness for different
personality types.
c autumn brown
A warm reddish-brown.
n autumnal colours
The colours characteristic of Autumn, particularly in reference to the leaves of
the trees of the English countryside with their rich variety of russets, oranges,
browns, yellows and reds. In North America the amazing colour change is referred
to as ‘fall foliage’. The process occurs by reason of leaves in the fall being sealed
off from moisture giving rise to the chlorophyll in them breaking down. Their
green colour thus gradually becomes masked by yellow, orange and brown
pigments known as carotenoids also present in the leaves. There are also red
and purple pigments called anthocyanins. The red, purples and bronzes in some
trees derive from the sugar produced in the leaves being trapped by the colder
temperatures. See also erythrophyll, phylloxanthin and xanthophyll.
a avellaneous
The light brown colour of the hazel-nut or filbert-nut.
c aventurine
A dark brown colour so called after the brown glass of the same name speckled
with copper or gold and first manufactured in Italy.
c avocado
The green of the avocado – usually in reference to the pulp rather than the skin;
also avocado-green. Perhaps from the Spanish abocado – a delicacy – or the Aztec,
ahuacatl.