WCAG requires a particular contrast ratio between foreground colors and background colors.

• AA compliance requires a contrast ratio of 4.5:1 for normal text (14 point and bold or larger) and 3:1 for large text (18 point or larger).
• AAA compliance requires a contrast ratio of 7:1 for normal text and 4.5:1 for large text.

Additionally, when establishing a color palette, keep in mind the two most common forms of color blindness are:

1. Red-Green color blindness, the inability to distinguish between red and green hues
2. Blue-Yellow color blindness and Total Color blindness

---

Some tools you can use to obtain the contrast ratio and see if you meet compliance standards:

• WebAIM Color Contrast Checker: http://webaim.org/resources/contrastchecker/ 
• Contrast Ratio tool:  http://leaverou.github.io/contrast-ratio/