Roughly 10% of the population is colourblind https://en.wikipedia.org/wiki/Color_blindness in one way or another, and the use of Red and Green as indicators is not optimal. For those with access to academic journals I recommend Ed Hawkins' paper in Nature http://www.nature.com/nature/journal/v519/n7543/full/519291d.html. I suggest instead the use of a red-blue scale which hits none of the major colourblindness axes.
A fading to white between red and blue can also give gradients of how beneficial/harmful an effect could be. Many people can easily distinguish up to 10 steps in that range, but I'd suggest only using 5 since the aim is to make things easier.
A fading to white between red and blue can also give gradients of how beneficial/harmful an effect could be. Many people can easily distinguish up to 10 steps in that range, but I'd suggest only using 5 since the aim is to make things easier.
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