Posts tagged coffee

The Universal laws behind growth patterns, or what Tetris can teach us about coffee stains

coffee, diffusion, KPZ, universality, tetris, bacteria, burning paper

Now, if you think about it, there’s something deeply puzzling here. Bacterial colonies, travelling flames, and coffee particles are all totally different systems, and there’s no reason to expect that they should obey the same mathematical laws of growth. So what’s behind this mysterious universality? Why do such different beasts play by the same rules?

http://www.empiricalzeal.com/2013/03/01/the-universal-laws-behind-growth-patterns-or-what-tetris-can-teach-us-about-coffee-stains/#more–2837

Caffenol Recipes

Caffenol, film, developer, photography, DIY, coffee

Caffenol Recipes that are proven to work can be found here. If not stated differently, the temperature of the solution should be 20 degrees Celsius or 68 degrees Fahrenheit. For all other temperatures, please adjust the developing time accordingly. If you have never used caffenol before, I suggest that you start with films that are proven to deliver decent results, for example the 400 ISO films Ilford HP5 Plus, or Kodak TMAX 400. Slow films that work are Ilford FP4 (ISO 125) and Ilford PanF (ISO 50). Developing times and links to example pictures can be found in the Film Development Chart.

http://www.caffenol.org/recipes/