- 1). Spray the neck of the bottle with devitrification fluid to ensure the color of your glass stays the same as it stretches. You can purchase it at a craft or hobby store. Skip using this fluid if you want to intentionally use the discoloration of the glass as an artistic expression.
- 2). Hang a glass by its neck from the top of the kiln. Use a wire hangar looped around the neck of the bottle to achieve this. The bottle should be as high as you can set it, allowing plenty of space for stretching. This will keep the bottle secure and allow it to stretch under its own weight as the heating process begins.
- 3). Set the kiln temperature at 500 degrees F per hour. When the kiln reaches 1,100 degrees F, turn off the heat for 10 minutes, then set it to 250 degrees F and continue the heating process until the heat inside the kiln reaches 1,300 degrees F.
- 4). Increase the heat of the kiln gradually. You can increase the heat at any rate you want during this stage, stopping when the neck of the bottle has stretched to your liking or until the kiln reaches about 1,400 degrees F.
- 5). Open the kiln and allow it to cool to 1,100 degrees F. This allows the glass to begin cooling without becoming cloudy or discolored. The technique is called annealing. Once you have cooled the kiln, turn it off and allow the glass to cool to room temperature on its own, then remove it from the kiln.
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