Photoelastic Polariscope Residual-Stress & Craze-Crack Risk Mapper (PC / PMMA / Glass)

Deterministic Michel-Levy birefringence color-chart inversion from RGB to optical retardation Γ (nm) + Stress-Optic Law σ1 - σ2 = Γ / (t · C_brewster) engine (.dng, .jpg, .png, .pdf) built for Covestro Makrolon, Plexiglas / Perspex, Schott Duran, Strainoptics Alt — zero-upload ephemeral Wasm RAM execution.

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