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.
The Public Record office and the British Government tend to enforce these marks and registration numbers.
Companies located outside the UK who have reproduced items, and tried to use a facsimile of the marks or numbering system have been sued, and have had sanctions imposed against them.
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).
The RHX method depends on the validity of this law for describing long-term RHX weight gain on archaeological timescales.
The RHX process produces an increase in specimen weight.
The information for this page was compiled with the assistance of the British Public Record Office, and the British Designs Registry Office. Their help, and permission to use the data, is certainly appreciated.
It is based on the fact that after a ceramic specimen is removed from the kiln at the time of production, it immediately begins to recombine chemically with moisture from the environment.
Starting in 1842, England has offered registration of it's decorative designs for pottery, china, wood, paper, pottery, china, porcelain, glass and more.
By using the information below you can find the date a design was registered. Remember this date is just when the design was registered.