Ted,
the word is "mishima" something I used to do a lot of, I really enjoyed using a cobalt carbonate mix with slip in the incised lines, then scrapped back, it looked slightly pink, fired it was blue back and glazed it had a strong line with a lovely blue haze around it, just the thought of it makes me want to do some more in my next firing, which should be at the end of next hopefully, if I carry on throwing, but I need some fo them for Christmas.. so I had better be busy!