The days when concrete had to be uniformly grey are long past and now clients and architects can choose from a wide range of colours and tones - indeed, chemists are continuing to add to the available pallette. The introduction of colour into concrete has breathed new life into what was for decades a functional building and paving medium. However, adding pigment to concrete is not new. Indeed, it was used to great effect during World War Ⅱ to disguise jungle airstrips. Among early problems was that the colours tended to fade. However, modern pigments can be produced that are stable to ultraviolet light and ensure both uniformity of colour through the mix and colour fastness with time.
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