I once read a potter (forget who, sorry) who wrote that we ought to test a new glaze in every firing, and I thought, "yeah, right, like I feel like adding one more thing to the pre-firing to-do list." But he was right, for two reasons: 1)If you don't test glazes when you are firing, when will you do it? When you aren't firing? How's that gonna work? 2)Having an unknown factor in the firing makes it much more intriguing. Here's a thought: if the kiln sits cool but full for longer than it needs to -- in other words, if I am not rushing to unload -- it's time to change things up.
I can get a used iMac for around $80, plus a whole boatload of shipping costs. Not too bad...it'll just take a while. See you then!