Influence of pigments on mechanical properties of colored concrete is presented in this paper. The paper is focus on the issue of dosing a powder pigment in the form of iron oxide into a prefabricated dry concrete mixture and its effect on mechanical properties of mixture. Based on the performed experimental tests, it follows that the proportion of added pigment has a fundamental influence not only on the resulting color intensity of concrete, but also on its mechanical properties. The measured values of flexural and compressive strength show a significant decrease with increasing amount of pigment contained.