Much stoneware is not so hard as porcelain and may be sampled by drilling.
Heated stone material, such as hearths, pot boilers, and burnt flints, has been dated as well.Some regions known to present problems for TL include Indonesia and West Mexico; objects from these areas usually do not successfully yield TL dates.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.Some of these are quite easy to detect; some quite difficult.
For example figures, normally modeled, may be carved out of brick or assembled out of fragments. It is an absolute dating method, and does not depend on comparison with similar objects (as does obsidian hydration dating, for example). The thermoluminescence technique is the only physical means of determining the absolute age of pottery presently available.WARNING ABOUT FAKES USING ANCIENT MATERIALS Recently there has been a spate of forgeries devised expressly to attempt circumventing TL dating.These use pottery of the appropriate period to construct objects.The TL laboratory at Daybreak was established in 1977 to make TL available to the art community in general. Studies at Oxford back in the 70s on Romano-British pottery indicated that when all quantities entering the age equation are measured, the TL date of a single potsherd will typically fall within 15 per cent of the known date.