Actual exterior color is Black 10YR 2/1. This looks potentially fried in one of the Gegharot fires. The internal slip has been completely roasted and continues to flake away. Altrenating embossed and zig-sag decorations highly resemble Ar/Ge.T16.109.C.6, where the interior was much less roasted looking, but still coarser and bumpy... Even the frequency of the zigs and zags resembles that C.6. Burnishing on the exterior surface has mostly abraded away, but is still visible in some areas. No corrosion to speak of. Lots of coarse inclusions are visible on the interior surface--very rough there.
From Interior to Exterior