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The ELT is generally close to (but not exactly the same as) the long-term annual mean surface air temperature. Any event involving exposure to extreme heat may reset the "clock" by dehydroxylating the specimen, as though it were just out of the kiln.For example, a medieval brick examined by Wilson and collaborators The main application of the RHX technique is to date archaeological ceramics.Stainless steel or aluminium normally provide the base for synthetic coatings.And the chemical PTFE is widely used to create the non-stick surface.

Efforts to successfully replicate the original work and overcome the challenges presented by archaeological ceramics are underway in several academic institutions worldwide.The dating clock is provided by the experimental finding that the RHX reaction follows a precise kinetic law: the weight gain increases as the fourth root of the time which has elapsed since firing.According to the RHX power-law, if the weight of a fired-clay ceramic increases as a result of RHX by 0.1% in 1 yr from firing, then the weight increase is 0.2% in 16 yr, 0.3% in 81 yr and 0.4% in 256 yr (and so on).Once that RHX rate is determined, it is possible to calculate exactly how long ago it was removed from the kiln.The RHX rate is largely insensitive to the ambient humidity because the RHX reaction occurs extremely slowly, and only minute amounts of water are required to feed it.

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