Mocha Diffusion aka Dendritic Slip
I first heard of this technique about 5 years ago, and seeing the detailed branching patterns that can form in seconds, I was immediately was very interested. I first saw mention of this technique in an article by Robbin Hopper, and then I found an article by Jeff Zamek with a little more detail on this technique, yet it wasn’t enough information to get very far with this mysterious and esoteric technique.
Mocha Diffusion is named after a type of stone, called a Mocha Stone, originating in Mecca this stone is a type of moss agate with naturally occuring dendritic formations through it. Dendritic structures like to happen naturally all over the place, in various minerals, occasionally in glazes, water running through sand at the beach, and your brain has something like 100 billion neurons each one having dendrites. The image used in the thumbnail of this post shows a piece of natural dendritiic druzy quartz that a friend gave to me, in front of a “landscape tile” I made with this Mocha Diffusion technique.
It took about 3 years of quite unfortunate experiments to even start getting decent results with this technique, and still today I find it unpredictable and much more complicated than it appears. I saw some images of pots made 200 years ago in England with great examples of Mocha Diffusion, which showed me how well this technique can result. I wasn’t sure what to try and the theory that many people claim, that this is a pH reaction between between a somewhat alkaline clay slurry and an acidic colorant wash hasn’t seemed to hold true. At this point I question whether there’s little or any truth to that claim.
This is a technique I am continuing to study and experiment with, and hope the results continue to grow more and more beautiful.