Glazing, firing and getting consistent results is a tricky thing, an art unto itself I think. One frought with frustrating variability. All these mugs were done the same way; b-mix clay, a section coated with red slip and carved with a Randi tool, bisqued, then glazed with buckwheat. The two left most mugs were from separate firings. I thought I was on to something after getting two separate results I was happy with, so I tried a few more, but I was disapointed in my next 2 mugs, which were fired together. I am guessing that either the kiln got a little hotter, or they were in a hotter spot in the kiln, as the red slip seemed to get runny. According to Aaron, red slip has iron oxide in it which is a flux, so if over heated it could make things flow.
