1.When burning it in the mud river, directly by fire, small fire preheating, and then big fire. 2.When burning, do not touch, don't put it on the table directly, so as not to burn the desktop (should be placed in the gauze with asbestos) 3.When heated, use crucible tongs to clamp (high temperature crucible should preheat the crucible tongs) 4. Do not use cold water to cool the hot crucible, so as not to burst. Size: 25ml

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