The color of calcium carbonate precipitate is typically white. This is due to the inherent properties of calcium carbonate, which is a white, inorganic compound. The white color is a result of the arrangement of the atoms within the crystal lattice of calcium carbonate, which scatters light uniformly across the visible spectrum. This scattering effect is known as diffuse reflection, and it is a common phenomenon in many inorganic compounds. The data supporting this observation comes from various scientific studies that have analyzed the optical properties of calcium carbonate. For instance, a study published in the Journal of Physical Chemistry B found that the white color of calcium carbonate is attributed to the diffraction of light by the crystal lattice structure. Additionally, the color of calcium carbonate precipitate can be influenced by impurities or the presence of other substances, but in its pure form, it is consistently white.