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Read the directions.
Glass blowing is a tricky process, but can be done if directions are followed carefully. Heat a small mass of pure glass to about 700 degrees
Celsius. Then use a long iron tube to pick up the glass. Roll it carefully into a ball by spinning the tube slowly. Then blow through the end of the tube
to hollow out the glass. By constant spinning, blowing, and reheating, you will be able to shape a bottle. The glass must then be left to cool and can
later be etched or painted.
What must be done next, once the glass has been blown to form a bottle?