Probably impossible to read for someone color blind... My ex was color blind. I kid you not, when putting in an alarm system he asked me if I was sure the red wire was matched with the red wire because he thought the red and green wire looked closer...
So, here's a color blind test just to increase awareness about better use of color. Maybe a white outline on that example would make it better.
https://enchroma.com/pages/test
about 10% of the male population and 0.2% of the female population are red-green blind (the gene sits on the X-chromosome, if it happens that you have just one, and it's the malfunctioning version... you got a problem)
so, color-blindness needs to be addressed in GUI-development. and it's not something that is only important to a very small fraction of the people. 10% men is a lot (it would mean, there are readers right here, who are, maybe even devs, and almost certainly EVERYONE knows at least someone who is colorblind).
EDIT: color blindness is extremely un-funny for people, who have devices with just one status LED: green = works, red = problem... and for them, both is just white-ish.