What is WCAG?

https://www.w3.org/TR/2008/REC-WCAG20-20081211/

Color Ratio:

Please make sure that all designs meet the AA compliance level. This means that the color contrast between background color and text color are at a ratio of 4.5:1 for normal text and 3:1 for large text. 

Here are some tools that can help you test the colors:

• http://webaim.org/resources/contrastchecker
• http://snook.ca/technical/colour_contrast/colour.html
• http://colorsafe.co/
• http://webaim.org/blog/wcag-2-0-and-link-colors/ 

Footer links and links within text:

Text links must differentiate themselves from the rest of the text in two ways out of the following (in order to be WCAG compliant):

• Bolded
• Underlined
• Different color
• Bigger size

For more information, please research on your own about the WCAG 2.0 guidelines http://webaim.org/blog/wcag-2-0-and-link-colors/