Traditional color cosmetics relied on iron oxides, titanium dioxide, and carmine for decades. Iron oxides provided the reds, yellows, and blacks. Titanium dioxide handled opacity and sun protection. Carmine, derived from cochineal insects, gave that particular crimson that synthetic alternatives struggled to match.
The shift started around 2019. BASF's Colors & Effects division introduced a line of calcium aluminum borosilicate-based pigments that could achieve 89% reflectance at specific wavelengths. Merck's acquisition of Versum Materials the same year signaled where the industry was heading.
I visited Merck's Darmstadt facility in February 2020, three weeks before everything shut down. Their interference pigment production line operates at tolerances that surprised me. The coating thickness on their Ronastar series varies by less than 15 nanometers across a batch. This consistency matters when you're trying to achieve that specific color shift from purple to gold that shows up in high-end eyeshadow palettes.