Which of the following things could you do in order to tell if a pair of colors has strong contrast?
a.
look at the colors on the visual spectrum.
b.
put text or images of one color on top of the other color.
c.
find out if they are additive or subtractive colors.
d.
find out the munsell numbers of each color.

B. Put text or images of one color on top of the other color.

C. Find out if they are additive or subtractive colors.

Explanation:

    We learned that in the trichromatic theory, which is ADDITIVE, by adding higher intensities of red green and blue, we get increasingly lighter colors until we get to white. If we mix, for example, red and blue, we have yellow, which is a lighter color.

    This is not the case when we are mixing ink, as pigments tend to increasingly absorb light waves as we mix them. If you mix red, green and blue inks, you will get a very dark shade of brown.

   In this case, the solution is the use of SUBTRATIVE mixing, which consists of using pigments that only absorb a particular primary color, rather than pigments that absorb them all. The process works in reverse, in RGB, when we have no color, we have no light, so everything is black. In the subtractive process, when we have no color, we have no ink, so everything is white (paper color).

c would  be the answer.