He made a lumen print. Probably normal photo paper, expose long enough and the image prints out, as opposed to developing out. Fixing will destroy most images made this way, so a quick copy is made to preserve it. Try one, very easy to do, lots of fun as well.
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I am here: http://maps.google.com/maps?ll=41.860143,-71.396707
I think color paper will work, but the image won't be in color. On the other hand b&w paper used this way often has a color to it, but neither paper will have color corresponding to subject color.
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I am here: http://maps.google.com/maps?ll=41.860172,-71.396779
These are commonly called Solargrams. A few have been posted here previously that were one year exposures.
I wonder if Harmon's Direct Positive paper would give any results?
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