This never happens to me. Not that I can remember at least.
But then, I don't differentiate with words much. I'll just call something green and not 'blue-green' or 'dark green' or 'army green' and so on.
I'm very very good at identifying and comparing colours, but spontaneously naming these various nuances correctly... forget it.
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Autism + ADHD
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The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it. Terry Pratchett