![]() Photo by Pappapeter and licensed under CC BY-SA 4.0.Īpart from diluting the para-aminophenol in water, Rodinal further requires the use of a few special salts, such as sodium hydroxide. Agfa’s popular black-and-white developer Rodinal is chemically closely related to Tylenol. It just so happens that a chemically closely related derivative of para-aminophenol, acetaminophen, is one of the cheapest and most widely available painkillers in the world – you might know it as Tylenol. Rodinal follows a fairly simple recipe (so simple that some actually do make “RoDIYnal” themselves at home), relying mainly on para-aminophenol as its developing agent. One of the most popular modern film development solutions, it was also among the first to be mass-produced. ![]() This can be crucial when developing film very quickly, as a few seconds here or there may in such cases affect the final result.Ĭommercial developers can be based on any number of chemicals. In between those two steps, some also add a stop bath – a concentrated solution that immediately stops the developer from acting further. After the developer is finished, a fixer is added to “fix” the chemical reactions going on inside the emulsion and prevent the film from fading over time. There is the developer, which activates the exposed silver halides within the film and does most of the work to render a negative. In order to really understand not just how to use caffenol, but also how to independently devise and perfect your own recipes in the future, it’s important to have a good idea of how photographic chemicals work to make pictures.Īt its core, any recipe for processing photographic emulsions consists of the same basic ingredients.
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