According to IWC, Ceralume is produced by homogeneously mixing ceramic powders with high-grade Super-LumiNova pigments — likely the same pigments that go into the paint that are then used to fill up the hands and markers on a dial. The brand claims, “In dark chamber tests, a fully luminous concept watch manufactured using the Ceralume technology has emitted a bright blueish light for more than 24 hours.”