To slightly gray paint has an intense blue value what color would you add to achieve the value you want
A red
b orange
c yellow
d green
red+blue= grey if proper saturation achieved.
http://daphne.palomar.edu/design/saturate/satscale.gif
Answeres to priciples of colors
Yellow
To achieve a slightly gray paint with an intense blue value, you would need to add the complementary color of blue, which is orange (option b). Adding a small amount of orange to the gray paint will intensify the blue value without drastically changing the overall color.
To understand why orange is the correct choice, we need to understand the concept of complementary colors. Complementary colors are pairs of colors that are opposite each other on the color wheel. When you mix complementary colors, they tend to neutralize or cancel each other out. In this case, adding orange (complementary to blue) will enhance the blue value by neutralizing the warmth of the gray paint and making it appear more intense.
So, when trying to achieve a gray paint with an intense blue value, the correct color to add is orange (option b).