a coupla close ups for all those who feel they can diagnose and advise - the lot on the left used fritt 4113, the left fritt 4110. only difference. the clay is called 'superior white porcelain' (and i've had a bitch of a time throwing it into anything fun.
side by side they looked like this:
i think may i need the glaze thicker, and a new recipe. i am calcined(ing) zinc in a bisque firing over the weekend. see if it makes any difference.
bring on the wisdom