You’re exactly right! 🎯 I guess you could try to describe red to that person but wondering if the millions/billions of touch points over the years associating red with certain things wouldn’t really make sense to someone with protanopia.
Just needed them red cones…😓
It’s an interesting problem.
It’s also amazing how much humans can overcome. Some of my work involves color coded wiring. It was years before I was tested for color blindness, and when I was diagnosed we had to figure out how it was I was able to do wiring so well.
I had to explain to my then employer, that red dye on wires was shinier than brown, and that’s what I thought red looked like on wires.
I also understand there is some connection between dyslexia and color blindness.
100%. Same with stop lights - even if you can’t see certain colors well people can still tell that there is a difference, at least in hue (or in your case shininess!). As long as they associate correctly, like the red one, however perceived, as being stop, they can adapt.
I always thought it was cool that when we test color vision the first page (the 12 usually) is actually a decoy to be able to see if people are trying to fake the tester for some secondary gain. Even a color bind person (no matter which type) will be able to tell you the number based on contrast, not color. Fun fact. 
