I'm not sure that "not talking to blind people in terms of color" can work, if only because sighted people do not consciously realize how often their speech is sight-related.
Since sighted people experience color as a non-trivial mix of visual *and other sensory* stimuli, we might as well rely on these other senses to convey color to blind people.
Will a blind person know what turquoise is as you know it? No.
But then, neither do I.
And why would we need to see it all the same way?