Artist Pigment, Fountain-Pen Ink & Print Window-Fade Lightfastness (ASTM D4303) Grader

Deterministic Unexposed-half vs sun-exposed-half flat-field normalized CIELAB ΔE2000 & ΔL*/ΔC* vector decomposition mapped to Blue Wool / ASTM D4303 tiers engine (.dng, .jpg, .heic, .png) built for Daniel Smith, Schmincke Horadam, Golden Artist Colors, Hahnemuhle — zero-upload ephemeral Wasm RAM execution.

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