| 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. |