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Drilling, the usual method of sampling, introduces some uncertainty.

It is also rare that any information about the radiation from the burial soil can be obtained, as art objects are usually thoroughly cleaned.

Much stoneware is not so hard as porcelain and may be sampled by drilling.

The clay cores from lost wax metal castings may readily be tested.

When pottery is fired, it loses all its previously acquired TL, and on cooling the TL begins again to build up.This radiation may in some cases contribute over half the total dose.Finally, one has to make the measurements regardless of whether the TL of the clay is well-behaved or not.This is adequate for the purposes of authentication where the question is whether the piece was fired in antiquity or recently; it will not differentiate, say, between a classic Greek terra cotta and a Roman copy.In some categories of objects, from China, for example, the actual age is quite precisely known for short-lived styles, and it is possible to work "backwards" to get information about the environment in many parts of the world, and some other parameters not usually measurable for art objects.

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