Two flat spot-color ink plates that don't quite register, with visible offset fringing — a Risograph misprint.
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Riso Print fakes a two-color Risograph misprint: the sharp <img> and a ::before duplicate (via --ifx-src) are each remapped to a flat spot-ink by an SVG filter (luminance then per-channel table toward the ink color, white at highlights), multiply-blended over a paper background, with the ::before plate physically offset by --ifx-riso-shift to give the tell-tale registration fringe. Pick --ifx-riso-a / --ifx-riso-b from the ink presets (SVG attrs can't read CSS vars, so inks are baked filter ids), --ifx-riso-shift for the misregistration, and --ifx-riso-paper for stock color. IMPORTANT: include the inline <svg> <filter> block once per page (ids must stay unique). Fully static: identical on touch, nothing to reduce for prefers-reduced-motion.
Enhanced — SVG filter. This effect uses an enhanced feature — provide a graceful fallback for older browsers.