Collodion POP Magnification
Image Structure
Collodion POPs are based on the light sensitivity of silver chloride. During processing the prints are almost always toned with gold chloride which partially converts the silver image to gold and changes the size and shape of the image particles. The image is made up of silver and gold particles.
Collodion POPs are based on the light sensitivity of silver chloride. During processing the prints are almost always toned with gold chloride which partially converts the silver image to gold and changes the size and shape of the image particles. The image is made up of silver and gold particles.
What to look for: Under low magnification the image will appear as a continuous tone. Under high magnification, the very fine image grain will be visible in the shadows and mid-tones.
Under low magnification of 10x, the image appears continuous in tone.
Under magnification of 30x, the image grain is beginning to become visible.
Under magnification of 50x, the image may appear continuous in tone. The very fine image grain may be visible in the shadows and mid-tones.
Layer Structure
Collodion POPs have a three layer support; a paper base, a thick baryta layer, and a collodion binder.
Collodion POPs have a three layer support; a paper base, a thick baryta layer, and a collodion binder.
What to look for: Under magnification, the paper fibers will be completely obscured.
Under 50x magnification with raking light, the paper fibers are totally obscured, indicating a three layer structure.
The cross section reveals a three layer structure.