Stephen Westand, a professor of colour science in the School of Design at the University of Leeds, has created a Colourchat blog which contains many illuminating entries on colour, clarifying many misconceptions about traditional teachings on colour. His ‘Colour Theory in 2 minutes’ thread houses short videos on fundamental colour concepts, explained clearly and concisely. 

Very comprehensive overview of how light is made, moved or lost to create color. Covers topics like color in the aurora, gemstones and rainbows, as well as color vision. WebExhibits is a public service of the Institute for Dynamic Educational Advancement (IDEA)

Reliable answers to many of the most commonly asked questions about colour (pdf, version available 254 pp). Includes a useful listing of recommended books and websites graded according to level of difficulty. 

Excellent site for parents and educators. Contains “A short animation to bring to life the everyday situations faced in the classroom by children who are colour blind.” (Note: The Colour Literacy Project prefers the term limited colour vision rather than “colour blindness”, as people with this condition are not completely blind to colour, and can indeed see various colours, but with a more limited range compared to the bulk of the population.)

Inspired by old family video footage, this short video by a sister trying to understand her brother’s limited colour vision gives a good introduction to colour perception and its variations.

Excellent introduction an overview of the electromagnetic spectrum.