A traditional concrete mixture comprised of cement, gravel, sand, and water is naturally grey, but adding color-changing compounds is becoming increasingly popular. The pigments infuse concrete with hues that are more stable than paint. Yellow and red variations are made using iron oxide; green and blue variations are possible using chromium and cobalt oxide, while black can be achieved with a combination of black iron and carbon oxide combined with pozzolanic cement.
"The concrete used on the façade of the Karlovac Freshwater Aquarium and River Museum in Karlovac, Croatia, was pigmented and produced by an on-site method on the building site, a special type and size of granulation were selected to achieve the desired effect - to make the facade color look like the color of the floor."
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