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To check the requirements, you can use colour contrast analyser tools such as:
- Colour contrast analyser: https://developer.paciellogroup.com/resources/contrastanalyser/
- Tanaguru contrast finder: http:// contrast - finder.tanaguru.com/ of https://addons.mozilla.org/en-US/firefox/addon/tanaguru-contrast-finder/
- Extensie Google Chrome: https://chrome.google.com/webstore/detail/accessibility-developer-t/fpkknkljclfencbdbgkenhalefipecmb
For info about why contrast matters: http://contrastrebellion.com/
Use of colour
Don’t use only colour to convey information. When colour is used to convey information (for example on a map of in a diagram), include another way to convey the information : textual labels, patterns, icons etc.
To understand more about colour blindness: http://wearecolorblind.com/
Visibility of links
Make sure that links can be distinguished from regular text, for example by using underlining for links. It is not enough to use a different colour for links.