The pearls in the pigment are small to the tune of ten-thousandths of a millimeter. Silica, Synthetic mica, Aluminum, Borosilicate, Polyester, and Metal oxides are some of the materials used to make the pearls. Different pearls are made using a different combination of these materials, depending on the purity, iridescence, and overall quality desired. Pearl pigments are made toxic-free as they are used to decorate different items that humans will interact with regularly. https://kppigments.com/blogs/news/the-use-of-pearl-pigments-in-epoxy-resins