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Re:Show HN: Grayscale the Web – A Chrome extension to help a... by gowld on Tuesday May 22, 2018 @07:16PM (#17130266)
That's the claim, but not an explanation. HN isn't multi-color.
Re:Show HN: Grayscale the Web – A Chrome extension to help a... by devastora on Wednesday May 23, 2018 @09:41AM (#17134077)
You have a point. But even though HN doesn't have a ton of color, it still feels different on grayscale I think.

Most of the evidence is anecdotal, but it seems to work for a lot of people (myself included). I went into it more here - https://news.ycombinator.com/item?id=17133984