The Beauty Signal
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The ingredient narratives reshaping clean beauty.

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Polymethylsilsesquioxane

aka PMSQ · methyl silsesquioxane resin · silicone resin powder

A spherical silicone resin powder providing silky slip, light diffusion, and a soft-focus effect in colour cosmetics. Used in blush and highlighting formulations for its optical blurring properties.

Benefits
  • Silky, velvety skin feel
  • Soft-focus and light diffusion — optical blurring of pores and lines
  • Improved wear and adhesion in powder formulas
  • Reduces skin-on-powder friction
  • Non-comedogenic at typical use levels
Example uses
  • Highlighting blush formulas
  • Powder foundations
  • Mattifying primers
  • Loose setting powders
  • Silky bronzing products
Formulation notes

Used in anhydrous powder formulas. Spherical morphology is critical for optical and sensory function. Incompatible with aqueous formulations without additional suspension aids.

Watchouts

Non-biodegradable silicone resin — same environmental persistence concerns as dimethicone. Excluded from environmentally strict clean-beauty standards.

Clean beauty perception

Contested in clean beauty for same reasons as dimethicone and other silicones — environmental persistence. Human safety profile is good.