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Platinum Print
Generally regarded as one of the most beautiful of the photographic printing methods, Curtis often used the platinum process to create his "master prints." It was popular until the early 20th century, when the rising cost of platinum virtually removed the process from the market. Because metallic platinum remains stable with exposure to air, moisture and water, no process is more permanent than platinum printing. Favored for their subtle gradations of tone and matte, and glare-free surface, platinum print photographs are highly sought after by collectors.
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Platinum print
An Ostobo Cowboy - Apache, 1903
An unpublished image.