Rehydroxylation [RHX] dating is a developing method for dating fired-clay ceramics. This reaction reincorporates hydroxyl OH groups into the ceramic material, and is described as rehydroxylation RHX. 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 concept of RHX dating was first stated in by Wilson and collaborators  who noted that "results
Bricks and concrete blocks are some of the oldest and most reliable of building products. Bricks were first used 5, years ago and were made from dirt using straw as a binder. Later bricks were made from clay and fired in a kiln to increase their durability. The history of concrete blocks dates back to ancient Greece and Rome, although they were not manufactured commercially until the early 20th century.
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