Recently I saw a post on Facebook with a blue circle, with a barely lighter blue rhino in it.  It equated intelligence with the ability to see the rhino.  It made me think of the need to keep color in mind in our instructional materials.  Around 8% of men and 1% of women of Northern European descent are color blind.  And the older we get the more difficulty we all have with certain color combinations.  So it is important to think about this for our students, if you like to use color in your documents or presentations.  Below are some known color combinations which are highly problematic.

  • Green & Red
  • Green & Brown
  • Blue & Purple
  • Green & Blue
  • Light Green & Yellow
  • Blue & Grey
  • Green & Grey
  • Green & Black

This website by Giacomo Mazzocato or by WebAIM can give you an online color checking tool.  The Paciello Group Website has a downloadable piece of software for Mac and PC which you might also find useful. If you use lots of color, please check the contrast.