I wanted to know more about color printing processes over the decades. That's me -- can't grasp the product without a peek at the process. I thought that the printing methods would have changed over the first 30 years of the 20th century. I thought if I put some common color postcards under a "microscope" (that is, scanned them at 2400 ppi), I'd see the eureka differences. Hmm...
The first few color views — from 1907 [Sample 1], 1913 [Sample 2], and 1924 [Sample 3] — look remarkably the same: a black and white halftone screen produced from a B&W photograph; then color added in splotchy patterns, probably applied with a "line block" prepared with a tint.
 1907 Undivided back era: Black halftone screen, with color tints added
 1913 Divided back era: Black halftone screen, with color tints added
 1924 White border era: Black halftone screen, with color tints added
 1935 Linen card era: Black halftone with mechanical color tint
 1960s Photochrome era: 4-color halftone
 circa 1907-1915 Divided back era: Albertype (variety of collotype), hand-colored
 1914 Divided back era: tinted collotype
7.5.05 (revised 12.6.05, 5.1.13, 10.31.15)
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