Monochromatic footage are not necessarily composed of pure blacks, whites, and intermediate shades of gray however can contain shades of 1 particular hue depending on the process. The cyanotype course of, for example, produces an image composed of blue tones. The albumen print course of, publicly revealed in 1847, produces brownish tones. Meanwhile, a British inventor, William Fox Talbot, had succeeded in making crude however fairly light-fast silver photographs on paper as early as 1834 but had stored his work secret.
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