Fit the protruding rim of the lid with the recessed rim of the Teapot, then lift it in one smooth motion. During this process:

If the sound emitted is sharp and high-pitched, it indicates that the teapot has been overfired, reducing its breathability;

If the sound is muffled and hoarse, it suggests that the teapot was underfired, resulting in excessive breathability; If the sound is balanced and harmonious, crisp but not shrill, with lingering echoes, it means the teapot has been fired just right, achieving suitable breathability.

It's important to note that different types of clay will produce entirely different sounds. When fired correctly: red clay produces a sharp sound, mixed clay (or Oolong clay) a harmonious sound, and purple clay a deep, stable sound. Different clays should not be compared based on their sounds.

While judging quality by sound isn't a scientific method, it can reveal certain issues.

The hoarseness or clarity of the sound primarily depends on the degree of vitrification (firing completeness): A higher degree of vitrification results in a crisper sound, lower water absorption, and a more lustrous appearance; a lower degree of vitrification leads to a muffled sound, higher water absorption, and a duller appearance.

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