Mean ceramic dating formula

This weight increase provides an accurate measure of the extent of rehydroxylation.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.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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Moisture expansion and weight gain are known to be proportional to each other for a specified material at any specified firing temperature.These components can be an intrinsic part of the object, for example materials added as temper, or compounds which have become incorporated into the object during use, for example organic residues, or compounds which have entered into the object during burial or conservation.The RHX technique was the product of a three-year study by a collaboration of University of Manchester and University of Edinburgh researchers, led by Moira Wilson.This reaction reincorporates hydroxyl (OH) groups into the ceramic material, and is described as rehydroxylation (RHX).The RHX process produces an increase in specimen weight.

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