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But reasons of cost and difficulty dictate that, for the foreseeable future, the amateur enthusiast will continue to depend on the appearance of bricks for date estimations.Brick and tile-making technology was originally introduced to Britain by the Romans.

After firing minute amounts of water slowly combine chemically with the ceramic leading to a very gradual, very small, gain in weight.Deciding on the date of a brick is a far from simple process.The very first point to remember is that bricks are regularly re-cycled; consequently bricks may well be older than the buildings that contain them.This is a mid-20th century development as is the use of modern Portland cement in mortar.A new way of dating archaeological objects has been found, using water to unlock their "internal clocks".

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