Footnotes
Chapter 2
[1] Sodium thiosulfate, later joined by ammonium thiosulfate, could dissolve the undeveloped silver salts in photographic coatings while having little effect on the metallic silver deposit of the image. Commonly called “fixer,” we also find these chemicals referred to as “hypo.”
[2] In Niépces’s time, the material he used was called “bitumen of Judea,” which today we call “asphaltum.” This material is used in photogravure printing, and is often brushed on finished gravure plates as a protective coating when they are to be stored. A plate thus coated, left by mistake in a sunny room, ends up with a rock-hard, insoluble coating.
Chapter 3
[1] This essay has been based in part on: The Permanence and Care of Color Photographs: ...
Get Nash Editions Photography and the Art of Digital Printing now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
