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In an important early 20th century variation of the process, known as carbro (carbon-bromide) printing, contact with a conventional silver bromide paper print, rather than exposure to light, was used to selectively harden the gelatin.A wide variety of colored pigments can be used instead of carbon black.You can follow any responses to this entry through the RSS 2.0 feed.You can leave a response, or trackback from your own site.The process can produce images of very high quality which are exceptionally resistant to fading and other deterioration.It was developed in the mid-19th century in response to concerns about the fading of early types of silver-based black-and-white prints, which was already becoming apparent within a relatively few years of their introduction.Today's 'toon was awfully, horribly, terribly, punishably tardy because I spent all fucking day trying to find a handful of largely fictional tax deductions.

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but by the 1950s carbon printing was very rare and supplies for it became an exotic specialty item.The process was later adapted to color, through the use of pigments, by Louis Ducos du Hauron in 1868.Carbon printing remained commercially popular through the first half of the 20th century.Alternately, have you heard any egregious anti- or pseudoscientific advice or explanations at your dentist’s office?

If so, submit your answers to The Prism Podcast/Carbon Dating Caption Contest at [email protected], @prismpodcast, or @carbonkyle using the hashtag #prismcaption.

The three images are then transferred, one at a time, onto a final support such as a heavy sheet of smooth gelatin-sized paper.