When’s the last time you looked at a ship? Picture a cruise ship or container ship in the harbor. Did you happen to notice that the bottom of the hull is always painted red? It’s not like you can see that snazzy paint job under the waterline, so what gives?

In early times, ships were mostly made of wood. That's why sailors had to cover their hulls (the part that’s sitting in the water) with copper paint to protect the vessel from wood-eating worms, barnacles, and seaweed. It was the copper that added a red tint to the paint. But what about now?

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TIMESTAMPS:

The answer's here 0:21

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