Placeholder. For most of its history, sunscreen was designed and tested almost exclusively on lighter skin, leaving white/grey cast as a decades-long unsolved problem for darker skin tones — a wave of newer brands is now explicitly correcting that blind spot with iron-oxide chemistry and PIH-focused formulation.
What we've found so far: Black Girl Sunscreen, VOUEE, and Live Tinted were all built specifically to solve white cast on deep skin tones; CeraVe's iron-oxide-blend tinted mineral sunscreen brought this science to drugstore pricing.
Open research: Interview founders of 2-3 melanin-focused sunscreen brands directly on their origin story; find historical evidence of how sunscreen testing panels were actually composed decades ago.