The Bickley process was used frequently in the construction of rackets courts, which, contrary to popular opinion, are not made out of slate, but of poured concrete. The black color is a result of the introduction of lamp black into the concrete mix, although the courts are usually painted these days.
The Bickley family used their own particular method of mixing, pouring and curing the concrete. The family secret went to the grave with the last family member active in the business. The walls were poured in place over 2-3 courses of brick. Water ran down the walls continuously during the curing process, making them incredibly smooth.
The last court built in the world was constructed at St. Paul's School in London in the late 1990s. Repairing a court is part masonry, part alchemy and part luck. When painting a court you use one mix for the front wall, another mix for the side walls and a third mix for the back wall.
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