Birds have been found with the substance congealed on their feathers, reducing their waterproof coating and ability to stay warm and afloat at sea.

BBC: Seabird deaths substance 'identified as oil substance'

She said the birds have been found with the substance congealed on their feathers, which reduces their waterproof coating and ability to stay warm and afloat at sea.

BBC: Seabird deaths: Pollution causes 'burning' to seabirds

It said PIB becomes strongly adhesive in the sea, coating the birds and restricting their movements and their ability to feed.

BBC: PIB chemical pollution kills more birds than MSC Napoli

Salt-roasting, which draws on the mineral's ability to conduct heat, generally involves cooking and coating a whole fish in a salt crust.

WSJ: Jenn Louis's Rock-Salt-Roasted Salmon and Turnips | Slow Food Fast