Thermoluminescence dating simple definition
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.
Some of these are quite easy to detect; some quite difficult.
Some regions known to present problems for TL include Indonesia and West Mexico; objects from these areas usually do not successfully yield TL dates.While not so accurate as radiocarbon dating, which cannot date pottery (except from soot deposits on cooking pots), TL has found considerable usefulness in the authenticity of ceramic art objects where high precision is not necessary.Since the university laboratories involved with TL are research facilities, they generally will not accept art objects for authentication on a routine basis.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.When dates of a number of sherds associated together are averaged, the error is reduced typically to 7-10 per cent. The succeeding 30 years, and increased understanding of the dosimetry, have not brought much improvement.