(60-30-10) RULE OF COLOR

ADDING COLOR TO YOUR SPACE(60-30-10.)

Afraid of using color in your own home? Don't be.
Decorating a space in terms of color is as easy as 60-30-10.Take a look at some rooms in magazines or in Designers' Portfolio. You'll notice that the rooms you like the most are almost invariably divided into percentages of 60-30-10. Why this works is anybody's guess.
Perhaps it is the human tendency to see an overall theme in the 60 percent hue, unifying the coloration. The 30 percent provides visual interest and the 10 percent, not unlike jewelry, provides that little spark of sparkle.

So, when decorating a particular room, divide the colors into percentages:
60% of a dominant color
30% of a secondary color
10% of an accent color

When you think about it, this color breakdown is similar to a man's business suit:
60% of the outfit's color is the slacks and jacket
30% of the outfit's color is the shirt
10% of the outfit's color is the tie

Translated to a room setting, it typically means:
60% of the room's color is the walls
30% of the room's color is the upholstery
10% of the room's color is, say, an accent piece or a floral arrangement

Dominant color

Rough 60 percent of the given space should be the dominant color. In the interior design terms, this color is for walls. Neutrals are the good choice for painting walls.

Secondary color

Next 30 percent should represent secondary color.

Accent color

The remaining 10 percent of the color scheme is for accent color. Accent color should be attractive. Warm vivid colors are good accents.

Using Color Harmonies

You can create harmonious combinations of color using split complementary color scheme, which exactly conforms this rule. Split-Complementary Color Scheme
This rich color scheme contains three different colors. One of these colors is complementary color, which should be used as accent color. Select dominant color and secondary color on the opposite side of the color wheel.
Example: Dominant = very light grayish yellow-green, Secondary = very light blue-green, Accent = light red.
Find out more details about other classic color schemes 

Introducing Fourth Color

Combination of three colors works well for the straightforward room decorating. However, you may want to apply more than three colors in your design, thus making the resulting color space more interesting. The only way to introduce a new color, is to split one of three colors. We should not split the accent color, because we do not want to lose accent. Instead, we can split secondary color without breaking the rule. While the hue of the secondary color remains unchanged, we can add a shade of the original color, thus preserving the whole harmony.
Exterior paints
You might find this "60-15/15-10" rule useful when selecting exterior paints for your house.
Conclusion
Remember, "60 30 10" is a recommendation. There is nothing wrong to use 65-25-10 or 60-29-11 proportions.
Furthermore, you can adjust colors to fit them to the requirements of the particular project.