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Pigments are mixed into the concrete to produce colours, other than the normal grey colour. If light colours are required, it is normal to use white cement and a pigment. The pigment is usually added during batching as a finely divided coloured inert powder or as a liquid. These may also contain plasticisers to reduce water demand and other constituents that reduce the occurrence of surface efflorescence and minimise colour fade caused by UV light.
Acknowledgement: The Concrete Society
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