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John Murray
The Diwan-i Khas from the Mussaman Burj, Agra Palace
1862-1864
Waxed paper negative, with applied media
37.1 x 46.4cm (14 5/8 x 18 1/4 ins) (image)
Metropolitan Museum of Art
Purchase, Cynthia Hazen Polsky Gift, 1988, Accession Number:1988.1134.1
LL/78010
Observation by Mark Osterman (facebook, 14 October 2017)
"the yellow retouching absorbs blue light during printing in the sun ... opening up those shadow areas."
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LuminousLint 
@LuminousLint