Opacifier
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Opacifier - A substance added to a material in order to make the ensuing system opaque. One example is Tin oxide (SnO2), which is used to opacify ceramic glazes.
Opacifiers must have a refractive index (RI) substantially different from the system. Opacifiers must also form small particles in the system. Opacifiers are generally inert.
Sometimes opacifiers are added to medical implants to make them visible under X-Ray imaging. This is especially true in the case of most polymers which are often unrecognizable in the body when viewed using X-rays.
Conversely, clarity may be achieved in a system by choosing components with very similar refractive indicies.
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