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remembered and recognized more easily that those of other colours. 
If Vernon is right (1962, p. 73j 75), and we can support her with our 
own experiences, than the fact that only eight colours are generally 
named (red, pink, orange, yellow, green, blue, purple, and brown) is a 
very weak spot indeed for the use of colour photographs for interpreta- 
tion. These eight colours,which can be named,contrast with the 120 pure 
colours distinguishable in the spectrum (Naumann, 1960, De 120) and the 
1 to 10 thousand of mixed colours in the colour-triangle (Mac Adam 1966). 
Skill in remembering can be improved by practice; typically, mostly 
women go to the market to purchase coloured buttons by just remembering 
the colours of the dress — and check at home to find good matching. 
Men don't dare to rely on their colour memory, even those who have & 
normal physiological colour visione See graph at p. €. 
[me author's experience with students from all over the world 
stresses the need for training in colour naming and thus in 
colour seeing and remembering: the seven colours of the rainbow 
have to be tought to many of the adults, in number as well as in order. 
Another point is interesting for associative thinking: is it 
possible that the lack of words for colours enhances the 
emotional reaction on colours? In analogy with smell, it could 
be possibles 
The subjective, almost unconsious appreciation of colours to 
work beautiful, ugly, quiet, activating, etc., is very difficult 
to catch into words. Among Western people, the order of 
preference is said to be fairly constant (blue, red, green, 
purple, orange, yellow (Vernon 1962, pe72)), probably they are 
symbolically associated through cultural tradition. However, 
when East and West meet on & double scanning stereoscope, 
colour appreciation may lead to some misunderstandinge 
A purely physiological reason may be responsible for colour 
appreciation and visual fatigue. The colour aberrations of the 
eye lens and the necessity of extra focussing for red and 
defocussing for blue cause eye-strain, depending upon anatomical 
differences from person to person. This could be the basis for 
the early appreciation of red by infants, and form the bias for 
the evaluation of later colour perceptiono 
Visual fatigue occurs especially when the eye cannot find its 
optimum adjustment. This is the case when counting trees on 
false colour transparencies, where blue and red are mixed and 
always one of the two being out of focus on the retina. Such 
eye strain cannot be reduced by training; it caused headache 
after a few hours work, every day anew (Miss CeP. Movia, private 
comme 1968) | Some consequences of colour perception for photo- 
interpretation are discussed in Par.}8.