Safe Web Colours For Colour-Deficient Vision

Colour is increasingly used these days to help convey information. When one in twelve men have some measurable degree of colour vision deficiency, the use of certain colours in certain ways can cause difficulty when navigating web pages or software, and even total illegibility in some cases. The key issue is to know when you are using colours which some people will not be able to differentiate - because that (for them) removes the benefit of using colour for visual cues. Colour scientists have long known which colours are confused by colour blind people, but this tends to be expressed in a way difficult for designers to utilise.

BT Group (2004). Articles>Web Design>Accessibility>Color