The red coating on ship hulls isn't paint — it's a continuously toxic defense system containing high concentration cuprous oxide that kills barnacle larvae before they can attach. Without it, barnacles cover the entire hull within months, roughening the surface and spiking fuel consumption by up to thirty percent — costing hundreds of thousands per voyage. Workers applying the coating require full protective suits and respirators. Effectiveness weakens over time requiring divers to physically scrape several tons of hardened barnacle shell from the hull bottom. And those barnacles that survive the toxic environment? They accumulate heavy metals far beyond safe consumption levels. Not seafood. Heavy metals.
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