My kiln is actually new. It's an L&L digital. I've had a Duncan for about 15 years before it quit, it was manual. I was just confused about the cone thing. Cause the clay says 4-6 cone but Standard recommends to fire at 5. I usually fire most things at 5 for glaze recommendations. But on occasion, I'll make something that is not glazed and want to fire higher to get the darker color.
Cone 5 with a 10 minute hold will get you to 5 1/2. With a manual kiln there's no cone 5 1/2 to put in the sitter, so you have to fire until visual cone 6 is bent to 3 o'clock, which equals about 5 1/2. Visual (large) cones start at about 1 o'clock, and you've reached the cone when they are bent all the way to the shelf, or 6 o'clock.
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