Firstly, I apologize for the quality of the photo. I'm using my web cam. as I still have not bought a new camera, and the old Canon is definitely dead(it did find new legs for a while).
I will replace the bad photos when I get a new camera.
This was the bowl that grabbed my attention from the last firing, it has rarely left my side for the past two days. It has a slashed indentation down the front, with a raised badge at the top. The brown ring is an iron oxide brush line.
Inside are a few marks from some small stones left in the clay, they have a blue colour, so figure it's a bit of basalt. This leads me to trying a similar colour as a brush work to the outside. I will try dulling a cobalt carbonate with some iron oxide. The right mix though? maybe 40/50 Cobalt/iron oxide. Your suggestion?