About 5% of the population (that is one person in twenty) has difficulty distinguishing colours, so red writing on a green background appears to them to be a single colored blank slide.
You can check out your slides or web pages at http://www.vischeck.com/vischeck/
Vischeck is a way of showing you what things look like to someone who is color blind. You can try Vischeck online- either run Vischeck on your own image files or run Vischeck on a web page. You can also download programs to let you run it on your own computer.
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