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• Fill your ceramic crucible with fused potassium bicarbonate (solid form). You should have enough bicarbonate in the crucible to past above the line of the remaining material from your experiments. If you need to fill the entire crucible, do so.  +
• Gently scrape as much residue left from the materials used in your experiment from the crucible.  +
• Place the crucible on a burner. Heat the c … Place the crucible on a burner. Heat the crucible until the fused bicarbonate melts. Heat it until a layer of red potassium salt appears on the surface. Using a mixing rod, stir the melt a few times. The entire melting procedure should take about one minute.ng procedure should take about one minute.  +
• Remove your crucible from the flame. Pour out the melt.  +
• Rinse the crucible in hot water. Use a cle … Rinse the crucible in hot water. Use a clean cloth to dry the surface. If your crucible is platinum, use alumina-impregnated nylon webbing to complete cleaning the surface. Let the crucible cool. For other notes, please refer to: [https://www.samaterials.com/content/usage-and-maintenance-of-different-crucibles.html Usage and Maintenance of Different Crucibles]ge and Maintenance of Different Crucibles]  +