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When I first looked at the black and white lines just now, I already saw a faint green and magenta glow in them. I hadn't even looked at the colored images yet.

Then I remembered that several months ago I tried this. Could it have possibly lasted that long?

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I also experienced this and saw the image a few months ago. That the effect lasts that long is sort of unsettling.

Yep, wikipedia cites a 1975 study "Extremely long-term persistence of the McCollough effect" in saying that the effect can last up to three months in some cases, after prolonged exposure.

I tried this several years ago and still see green and pink when I look at the black and white lines. The green in particular is quite strong.

Same here, though the effect is not as strong as it used to be. At first glance I see the colors, but then they are gone and all I see is the black and white stripes.

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