Only a tiny amount, about one part in a thousand of the paint by weight, is needed, and other marine species are not, as far as can be ascertained, affected by it.

ECONOMIST: Monitor: Reducing the barnacle bill | The

And lest any potential consumer should worry about grinding his teeth on food laced with the stuff, only one part in 1, 000 needs to be added to achieve protection.

ECONOMIST: Pest control