- 
of white paper, the place looked at will not appear to be white, or of 
the coror just seen, but of a blue green hue. This is the complement- 
ary of red ; that is, if this color is mixed with red, it will produce 
white (gray). These are also known as opposite colors and contrasting 
colors. The cause of this effect of opposite or complementary colors 
is explained in this way : When the eye looks at a white object, all 
of the nerves are equally excited and equally active, and consequently 
become equally fatigued ; but if a red object is looked at, then only 
those nerves that are acted upon by the waves that produce red are 
affe.'ted, and the others are in a state of rest ; but just as soon as the 
eye is turned from the red object, the other nerves assert themselves, 
and the nerves, that were acted upon by the red, having become 
temporarily enfeebled, are overpowered for the time and a color is 
perceived, that, if added to the red, would produce white (gray). 
Whatever color is looked at, its complementary is afterwards im- 
pressed upon succeeding objects for a brief time. 
Luminous 
colors. 
The luminous colors are those colors that reflect 
light in large quantities ] these are Yellow, Orange, 
Red and bright Green. 
These colors are most luminous when used without the mixture 
with them of other colors. 
Yellow is the most luminous of the colors. 
Rood calls luminosity one of the three color constants, the two 
other being purity and hue. "It is evident, then," he says, "that 
brightness or luminosity is one of the properties by which we can 
define color; it is our second color-constant " 
Harmony of Harmony of colors is such an agreement between 
colors. the different colors of a design or composition as will 
produce unity of effect. 
Scale of Yellow Green. 
Scale of Green, 
Scale of Blue Green. 
LIGHTER YELLOW GREEN. (Tint 2.) 
LIGHTER GREEN. (Tint 2.) 
LIGHTER BLUE GREEN. (Tint. 2.) 
LIGHT YELLOW GREEN. (Tint I.) 
LIGHT GREEN. (Tint I.) 
LIGHT BLUE GREEN. (Tint I.) 
GREEN. 
DARKER YELLOW GREEN. (Shade 2.) 
DARKER GREEN. (Shade 2.) 
Scale of Hues and Tones of Green. 
DARKER BLUE GREEN. (Shade 2.) 
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