6. When did the mortar to dry according to the number of dimensions of the furnace, it will bring the prepared mortar furnace by burning. Approximately 5 days to wait more firewood, and to control the heat of the stove by way of notice from the sound of the mortar between flaming. If the inside shows that the fire was too strong to make mortar crack must reduce the heat down and burnt clay molding experiment example mortar brought up to watch how the colors are cool, now a trial ground down. If the soil surface, for example, red indicates that there is not enough heat. If sufficient heat the soil sample will have dark skin color when they cool down, or when soil samples come knocking is loud kangwan.
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