3.2.2 procedures for comparing general features when burning charcoal wood charcoal from shells and ordinary child Niang
3.2.2.1. Plain wood charcoal burning
3.2.2.2 Notice the eruptions of ash, charcoal, and then save the results
3.2.2.3 observe the occurrence of smoky, charcoal burning, while carbon and save result
3.2.2.4. Observing the effect of saving coal and combustible
3.2.2.5. Note that the heat of the coals, and then save the results
3.2.2.6. Burnt charcoal from shells of the Niang
3.2.2.7 3.2.2.2 text duplication-3.2.2.5
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