My photography has come full circle as I started at age 20 developing my own monochrome negatives and now I have rekindled this interest by developing a colour film in Coffee as a monochrome image. Of course after developing I have to scan in the images.
On this first attempt the film was developed too long (20 mins!) and the images where quite dark - but useable by the scanner.... but with lots of grain. Next attempt I'll use the same mixture but develop for only 10 mins and see what happens.
These are links to the many articles and youtube videos about caffenol developing and similar receipes on the net.