This material was copy righted

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This material was copy righted in 1965 by
Interchemical Corporation 67 West 44th
Street New York, NY 10036 All attempts to
contact them have gone unanswered. All searches
on the web turn up void. 8 July 2K1 Dick
Heckathorn
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What The Color Blind See Most color-blind people
confuse the colors red and green. To them they
look like nearly identical grays, as shown on the
right half of the demonstration.
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Simultaneous Contrast Background colors affect
foreground colors in many unexpected ways. Both
arrows are the same shade of grey. Note the
difference in hue and lightness because they are
on different background colors.
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Simultaneous Contrast Although this is a
continuous ring of the same color grey, you can
change its color by placing your finger or a
pencil along the line separating the red and blue.
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Simultaneous Contrast The two light blue colors
in the demonstration appear different but are
actually printed with the same color paint.
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Simultaneous Contrast All of the leaves in the
demonstration appear to be about the same grey
color. Actually, the leaves on the yellow panel
match the light grey side of the flower pot. The
leaves on the maroon panel match the dark grey
side of the flower pot.
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Contrast Stripe Effect Colors on a non-uniform
background are subject to many unexpected
changes. The blue areas in the pattern are pained
with exactly the same color ink. To observe
heightened effects look at it from a distance.
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Spreading Effect Divide the illustration in half
by placing your finger or a pencil between the
black and white grills. The red behind the black
grill will look different from the red behind the
white grill.
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Vibration Look steadily at the demonstration.
Complementary colors of equal lightness and high
saturation have a tendency to make each other
appear more brilliant. To some this is a visually
disturbing effect.
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Chromatic Black and White Hold the demonstration
an inch or two from your eyes and you will see
streaks of different colors next to the black
lines.
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Spots Before Your Eyes Flickering gray spots
appear as you glance at the checkered pattern.
Look at one particular gray spot and it
disappears. Keep staring to see other effects.
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Stare at the black dot in the flag for half a
minute..
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Stare for half a minute at the black dot in the
green heart.
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Day and Night Vision The red and blue flowers
are equally visible but after the eye becomes
accustomed to very dim light (in about 10
minutes) the red flower disappears and the blue
flower looks light grey.
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Advancing and Receding Colors The red wall at
the end of the hall seems closer than the blue
wall. Red is an advancing color and blue is a
receding color.
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Additive Spacial Fusion Alternating squares of
yellow and blue are seen at reading distance. At
a viewing distance of about 25 feet the yellow
and blue squares are fused into a uniform gray.
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Legibility Two of the examples have good
legibility. The others are hard to read at a
distance or in dim light. Differences in hue or
saturation are not as important in achieving good
legibility as the difference in lightness between
the letters and the background.