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Start by cleaning the bottles, any dust, oils or left over glue from the label will mar the glass. If you are using kiln setter kiln. Place a cone 015 or 014 in the set device and turn up the heat slowly. It should take 4 to 6 hours to fire properly. If you are using a kiln controller, use a 8 segment program and raise the temperature as follows segment 1, 250 degrees, segment 2 500 degrees, segment 3 700 degrees segment 4 1000 degrees. segment 5 1200 degrees, segment 6 1480 degrees for 10 minuets, segment 7 1000 degrees soak for 1 hour, segment 8 700 degrees for 15 minuets. The kiln should cool for at least 8 hours after segment 8 is finished. Bottles with paint for their labels should have kiln paper placed under the bottle. Cracking occurs when the temperature is raised or lowered to quickly. Also if the temperature stays above 1350 to long there is a risk of a dull finish on the glass.

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