Epoxy resin-based opaque pigments are solid colorants that are specifically formulated for use with epoxy resin. Opaque pigments are a type of colorant that is completely solid and does not allow light to pass through. This means that when applied to a surface, they will completely cover and obscure any underlying layers or colors. They are designed to mix seamlessly with the resin and provide a consistent, opaque color without affecting the resin's curing properties.