Do mineral sunscreens leave a white cast?

Traditional zinc-based formulas can leave a white film, especially on deeper skin tones. Several listings here advertise transparent or micronized zinc to reduce that effect, and EltaMD UV Sheer and Colorescience No-Show earn high Amazon averages partly on no-white-cast claims. Customer ratings are encouraging, but we did not have independent before/after testing to verify cast performance across the full range of skin tones.