Fine Porcelain

How do I determine if I see hairline cracks in porcelain glaze are only in the enamel and do not finish?

I container antique Limoges porcelain that has no opening, or rather, no removable cover, which opposes look inside to see the porcelain. There are many very fine (visible) cracks running across the track that are undetectable except at close inspection. Is there some kind of definitive test to determine if these "lines" are only in the enamel?

Tap or flick the piece with your fingers. If the cracks are only in the glaze, it will ring. if the cracks through the porcelain, it will be dull and low.

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