Some factories run on phthalic anhydride, though you almost never hear it spoken aloud. Rather than switch formulas, companies keep coming back and what it handles speaks loudly. Demand climbs, so orders grow, round after round. Every now and then, things nearby hold onto faint marks, slowly changing everyday items. Because new uses appear so quickly, old ideas about how they work tend to vanish. One small change in access could spread across many areas at once. Even if some
