Take pearlescent pigments as an example, pearlescent pigments are a class of pigments with pearl luster, which are deposited on the substrate (generally natural mica, synthetic mica, glass sheet and other sheet-like materials) above a layer or alternately deposited multiple layers of metal oxides or non-metallic oxides and formed a flat sandwich body with a structure similar to sandwich. Due to the difference in refractive index between the substrate and the oxide deposited on its surface and each oxide, when the light shines on the surface of the pearlescent pigment, the incident light will be refracted and reflected at the interface of each layer of the pearlescent pigment, and the color of the pearlescent pigment that people see is the result of the superposition of light after multiple refractions and reflections of the light, that is, the interference phenomenon of light.

Despite the approval of certain mica-based pigments for food use, concerns continue to arise regarding their safety. One primary issue is related to heavy metals that can sometimes be found in natural mica. For example, if the mica is derived from contaminated sources, it could potentially introduce elements like lead or arsenic into the food supply, raising health concerns. It is crucial for manufacturers to source their mica from reputable suppliers who perform thorough testing to ensure its purity.

Uses in Industry

Making Paint with Mica Powder A Creative Guide