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... e to move downward, burning against the direction of the oxygen flow. The charcoal makers control the size of the flame by adjusting the ventilation; they seal up the vent that the flame reaches and then block the flame vent, until they see blue smoke emerging, which signals that it’s time to cool down and await the kiln to be opened.
After listening, Xiulote mentally simulated the specific burning process. Generally, the charcoal near the flame vent should be overburned, with the best q ...
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