UVO Colorants are concentrated, phthalate-free urethane color pigments that resist ultra-violet light. By adding a small amount of UVO to a Smooth-On^® epoxy, urethane rubber, plastic or foam product, these pigment dispersions will yield opaque castings (vs. SO-Strong™ color tints that can yield translucent castings). UVO colorants are highly concentrated, offer excellent dispersion and consistent color. A very small amount will color a proportionally large amount of liquid material. UVO colorants can be blended, combined on a palette to create a custom color before adding to material.