| 21. | They took with them all the heavy photographic equipment they needed to produce iodinated collodion negatives.
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| 22. | Silver burns were so common that collodion photography was called " the black art ."
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| 23. | As long as the collodion remained at least partially wet, it retained some of its sensitivity.
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| 24. | The collodion process was used on a glass photographic plate to capture an image on the plate.
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| 25. | It was composed of 10 % camphor, 45 % nitroglycerine and 45 % collodion ( nitrocellulose ).
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| 26. | Parkes patented his discovery after realising a solid residue remained after evaporation of the solvent from photographic collodion.
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| 27. | The wet plate collodion process has undergone a revival as an historical technique over the past few decades.
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| 28. | As with all preceding photographic processes, the wet-collodion process was sensitive only to blue light.
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| 29. | Typically, methods involved coating or mixing the collodion with a substance that prevented it from drying quickly.
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| 30. | This method became known as the'wet-plate collodion'or'wet collodion'method.
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