Red/Green is non-accessible for color blind users.
You should pick different colors for your red/green bars because they are inaccessible for color blind users.
Here is a good article that talks about color choices for all the different versions of color blindness: http://www.uxmatters.com/mt/archives/2007/02/ensuring-accessibility-for-people-with-color-deficient-vision.php
8
votes
Russell Hay
shared this idea
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Anonymous
commented
Interesting. What happens when the person does negative color by triple tapping the home button on an IOS device?