I think they mean there many hues that some people will cal blue and other will disagree. And definitely if you try to buy paint and just say you want "blue" th

I think they mean there many hues that some people will cal blue and other will disagree. And definitely if you try to buy paint and just say you want "blue" there's a huge spectrum of things you might get This website was doing the rounds not long ago: https://ismy.blue/ https://ismy.blue/