I fired ^6 reduction for 20 years in Montana at Montana State University in Billings.. I did very much the same thing. Start with candling the kiln for an overnight soak, come in at 7 am to turn it up and continue. Body reduce between 09-04 (guide cone) and continue to when 5 was starting . I usually reduced for 45 minutes, clear the kiln for 5-10 minutes and shut down. Close the burners and peeps. Depending on the size of kilns, how it is loaded /density of work, the firing varied. One kiln was about 45 cubic feet. The large kiln was a car kiln and had huge burners chosen by the facility services and not me. It was difficult to fire slowly. Both kilns were designed and built by me. They usually finished between until 3-6 pm. Reduction does not have to create a lot of smoke. I use the stick method of holding a stick in a reduction flame coming out a peephole. If it doesn't burn, the kiln is reducing. Depending on the gas source the flame can be purplish, blue or green.
I also fired ^6 reduction in a large Olsen updraft when I taught at UT Brownsville outside on a covered pad. I did not know it well enough to soak overnight so I following the previous instructors kiln log and fired it easily and evenly. I started the initial firing at 7 and turned it up every hour. It had 14 burners coming through the floor and was an updraft. Body reduction from 09 for 1/2 hour to 45 minutes 04 was more of a guide cone, then up to ^10 the first 2 times them I fired to ^6 the second semester. These firing went from 7 am to about 9 pm. The kiln was about 100 cu ft. and back breaking to load.
I taught a ^6 reduction firing workshop at Corpus Christi Art Center in a newer Bailey kiln. Nice kiln. The man who had purchased and fired the kiln had passed away. I found the target bricks on the shelf in the kiln room and placed them in the combustion area of the kiln. Loaded the kiln and fired it in about 12 hours I think.
All these firing produced copper reds, celadon, iron reds, tenmoku, They looked like ^10 glazes.
- Mark (Marko) Madrazo likes this