[HN Gopher] Wet Plate Photography Makes Tattoos Disappear
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       Wet Plate Photography Makes Tattoos Disappear
        
       Author : DanBC
       Score  : 17 points
       Date   : 2021-03-07 14:31 UTC (8 hours ago)
        
 (HTM) web link (petapixel.com)
 (TXT) w3m dump (petapixel.com)
        
       | amluto wrote:
       | I wonder if the spectral response of modern cameras is such that
       | a suitable linear combination of R, G, and B would reproduce the
       | effect.
        
       | simonblack wrote:
       | It took a lot of research to invent panchromatic film. Up until
       | about 1940, most films had problems in being sensitive to the
       | whole range of colors.
       | 
       | Most films on sale were 'orthochromatic' which signified that
       | they weren't sensitive to red, and so you could develop them in a
       | darkroom with a red 'safelight'. It also meant that red showed up
       | as black on the final photo.
       | 
       | When I first started playing with photography in the mid 1950s, I
       | killed several films while developing them because the books I
       | was learning from assumed you were using 'orthochromatic' films
       | but I was using the newer 'panchromatic' films.
       | 
       | I soon learned that I needed to develop my films in total
       | darkness, but I could still use a safelight when printing those
       | black and white negatives, because the printing paper didn't need
       | to be panchromatic seeing that it was only working with shades of
       | grey.
        
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       (page generated 2021-03-07 23:02 UTC)