The Physics of Physical Mineral Light Scattering Over Makeup
Mineral setting powders rely on physical crystalline minerals (principally non-nano zinc oxide and titanium dioxide). These minerals have exceptionally high refractive indices (n = 2.0–2.6).
When applied across the skin, the micro-particles form a reflective mirror-like shield over the stratum corneum. Instead of absorbing photons into skin tissue, they reflect and scatter incoming UVA and UVB rays away from the face, providing immediate physical protection without requiring a 15-minute chemical activation window.
Proper Priming & Maintenance of Flow-Through Powder Brushes
Flow-through brush applicators rely on gravity and atmospheric pressure to feed powder from the lower reservoir through the core of the synthetic bristles. If the brush is not primed correctly, it will deliver uneven, splotchy coverage.
To prime a new brush, tap the base firmly against the back of your hand until you see a tiny cloud of powder emerge from the bristles. Always sweep in firm, circular motions across the skin to ensure the mineral particles lay down in an overlapping, protective matrix.