Photograph Toning with Tea and Coffee 

theartofphotogr...
/ tedforbes
In this video, we'll do a full tutorial on how to organically tone prints using household items such as tea and coffee.
The process is quite simple. Note that I am using fiber-based, darkroom prints. You can and should certainly experiment with different papers, but my personal experience has simply been that this is the easiest paper to work with. Often times glossy papers are harder to get to take the stain.
The process is quite simple -- you just need some coffee and tea at room temperature and you'll use time to get the best results. The interesting effect here is that the coffee and tea only stain the white paper. The silver (dark tones) don't stain. I love these methods because they add a different effect depending on the amount of light or dark areas in the image.
You could also use red wine, food coloring or any other liquid that will stain the image. Experiment, record your results and have fun!