Thermoluminescence Test (T.L.) - The test conducted to
determine the amount of thermoluminescence (T.L.), the violet-blue light
emitted by clay that has been heated or fired and which intensity is
directly proportional to the time that has elapsed since fired. Thus,
the build up of T.L. over time, detected with a very sensitive device known
as a photomultiplier tube, which measurable signal can determine the date
(+/- 100 years range approx.) of the ceramic piece. Oxford
Authentication Ltd in the U.K. is the foremost renown laboratory in the
world for thermoluminescence testing and also the only facility in
compliance with international quality assurance standards.
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