Some pseudo-isochromatic plate books have the pages in binders, so the plates may be rearranged periodically to give a random order to the test.
2.
After DeCurtis failed the first test, called the Dvorine Pseudo-Isochromatic Plates and known as the PIP test, D'Agostino gave him a second test, investigators said, which he passed.
3.
His career spanning six decades, Bell worked in nearly every major early photographic process, including daguerreotype, collodion processes, albumen prints, stereo cards, and early film . the use of pyrogallic acid to recover gold from waste solutions, and the development of isochromatic plates.
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