Ghostly migrant mother

‘Migrant Mother’ is possibly the most famous photo in the world. It’s now on Flickr, scanned from the – slightly tricksy – original negative:

Destitute pea pickers in California. Mother of seven children. Age thirty-two. Nipomo, California (LOC) (by The Library of Congress)

It’s tricksy because the negative itself was retouched in the ’30s – can you spot the change? I couldn’t, despite knowing what I was looking for. Then I looked at the original, and the edit is now all I can see. Probably forever. I can’t believe I never noticed it…