How to identify genuine bone china

There is no single test you can do at the kitchen table that proves a piece is bone china. Several clues together make it likely; only a laboratory analysis of the fired body confirms it.

Translucency: a clue, not a proof

Hold a cup or plate up to a bright light and place your hand behind it. Thin bone china usually shows the shadow of your fingers through the body. But thin hard-paste porcelain and some fine china are translucent too, and thick or heavily decorated bone china may show little. Translucency tells you that a piece is a thin, vitrified, white body — not what it is made of.

The backstamp

Most makers print the words “Bone China” or “Fine Bone China” on the base, often with the maker’s name and country of manufacture. A backstamp is the maker’s declaration. It is usually honest, and it is the best everyday evidence — but it is a statement, not a measurement, and it does not always say who made the ceramic body. A brand can commission bone china from another factory.

Weight, sound and colour

A thin, well-made piece feels light for its size and may ring when tapped. A warm, bright white is typical. These are useful impressions, but they are shared with other fine porcelains and depend heavily on design. None is decisive.

“New bone china” and “fine china”

“New bone china” is a trade name for bodies that resemble bone china but contain little or no calcium phosphate. “Fine china” usually describes a translucent porcelain without significant bone ash. Neither is bone china in the standard sense. If composition matters to you — for performance, provenance, or dietary or religious reasons — ask the maker for the body composition in writing.

For trade buyers

• Ask for the tricalcium phosphate content of the fired body and the method used to measure it.
• Ask which factory made the body, not only which brand decorated or sold it.
• Ask for test reports naming the standard and clause for any performance claim.