The "Mearlin" pigments produce a bright, smooth nacreous luster in thermoplastic materials, such as polystyrene, polyethylene, polypropylene, polyvinyl chloride, and acrylics. The preferred concentration depends on the thickness of the plastic object and the effect desired; generally 1% of the weight of plastic produces the desired effect in fairly thick objects, such as polystyrene jars or polyethylene squeeze bottles. Higher concentrations, up to about 4%, are used for low gauge material such as polyvinyl chloride film. For a smooth, uniform nacreous effect in the finished object, it is desirable to incorporate the "Mearlin" pigment in a preliminary blending step, such as a two-roll mill for PVC or a Banbury mill for thermoplastic material in general. It is often satisfactory to add the mearlin pigment as a dry powder, but sometimes the incorporation step is more rapid over-all if the Mearlin powder is first made into a paste with a suitable liquid, such as dioctyl phthalate for PVC, mineral oil for po
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