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I agree this article doesn't present any evidence for the question it poses, but it's ridiculous to say Van Gogh couldn't be color blind. Especially given your examples are not impacted by the most common forms of color blindness.

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His pictures are full of subtle shades-play of every color.

I'd expect that even if he'd been totally blind, given the normal process of mixing paints on the palette before painting with them and that this is imprecise.

(Obviously I don't think he was totally blind, I'm only saying subtitles of colour aren't evidence of anything).

He would not had subtle shade play in all those colors. You would expect shades to be used subtly badly.

That's exactly what the researcher found -- excessive green where it didn't belong, but brown did.

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