Valuable lessons can be learned from mistakes and unplanned events (I should be a wealthy person by now!). I have forty pieces that are meant to be lessons in glazing (I'm a very new potter). The clay and the commercial glazes are matched at cone 5/6. I carefully documented every glaze and glaze combo (learning how easy it is to misremember how many coats I brushed - 2 or 3?).
The pottery store did the glaze firing and the unplanned event turned out to be a bad bottom element in the kiln. After firing for about 16 hours (a cone-sitter controlled kiln), it was discovered that the kiln never reached cone 5. After cooling, the pieces were moved to a working kiln and fired to cone 6.
I haven't seen the results yet (not cool enough from the second firing). With the centuries of experience here, can anyone speculate whether or not my careful documentation will reflect a true evaluation of the glazes and combinations I used?
I appreciate your fellowship and willingness to share from your experience and knowledge. Perhaps someday, I'll be able to contribute to the answer from someone else's question. In the meanwhile, I am very much enjoying my new activity.
Thanks for your input.