Not any pigment can be used in concrete. The chemistry of portland cement plus exposure to sunlight and weather can cause most integral concrete colors to fade.
Integral Color Concrete Pigments and Colorant Products
Integral Colors
Colored Concrete Trends: Dyes, Stains and Pigments
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Integrally Colored Concrete: Managing Expectations - Concrete Decor
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Integral Color: Everything You Need To Know
Powdered Integral Colors (25LB Bag)
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Concrete Resurfacing with an Effective Roll Top Cement System