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This is a great article with some really helpful tips when you want to create an accessible Web Site. It covers topics like “Information on Color Blindness”, “Tests for Simulating Color Blindness”, “Supplementing Color Coding”, “Vibrating Color Combinations”, “Textured Backgrounds”, “Color Blindness Links”.
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Here you find a really good resource if you want to learn more about color blindness. It covers topics like “What colorblindness is”, “Clinical information about color blindness”, “How color blindness works” and much more.
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This one is a great tool if you want to test how you website looks to colorblind people. you just type in your url and select a color filter… and thats it. So go on on test your website! 
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In this article, Mostafa Mourad -a User Interface and Web Designer- explains how he sees the world. Interesting!
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“GrayBit is an online accessibility testing tool designed to visually convert a full-color web page into a grayscale rendition for the purpose of visually testing the page’s perceived contrast.” Nice tool for a quick test.
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Color Oracle takes the guesswork out of designing for color blindness by showing you in real time what people with common color vision impairments will see.
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Use our Colour Blindness Simulator to reveal how your images may appear to users with a variety of colour blindness conditions.
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Vischeck color blindness simulator
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crazyleaf: Thank you both for your appreciation, and thank you Thomas for the opportunity. Definitely Thomas you should listen...
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