About 8% of men and 0.5% of women are color-blind. It's therefore critical to choose colors that will readable to your entire audience.
Use color-blind friendly colors. Avoid certain combos such as green & red or blue & purple (see the chart below)
You can use the following chart to help you pick color-blind friendly color combos. The left panel represents what most of the population sees. The two right panels represent what colors look like in two different forms of color-blindness.
The blue boxes illustrate that color combos can look very different in color-blinded and non-color-blinded vision. For non-color-blinded vision, green and bluish green is almost indistinguishable but for a color-blinded person, red and green are similarly difficult to tell apart.