In a conventional stoneware firing, the 6 is just a watch cone - it's there to judge how evenly the kiln is firing (answer, always, with my kiln: not very) For the soda firing, the six falling is my signal to mix up the soda salad. Some firings I start adding the soda right after 6 falls; other times I wait until the 8 is falling. I kid myself that I can see a difference: that I get more even application if I wait, more directional if I start early.
This time I think I'll wait. I'll do up the soda mix now, but apply it when 8 falls. We can judge the results together on Saturday!