Jan, my comments are in a
Again, 1000F is not a bubble squeeze, it is the strain point. The bubble squeeze is at 1150F. The long soaks are for very complicated and multilayered pieces. 30 mins should be sufficient. A soak at too low a temperature does not do anything as the glass cannot fully slump, so when you speed up and go to higher temperatures, the piece seals the air that is left within. Make sure your bubble squeeze is at a high enough temperature. Look again at the S96 site and you will see 1150 as the temperature.