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Mostly, Hynes called him O’Casey, but a few times she called him Sean, and the warmth of that familiarity melted away any sepia encrustation that has accumulated around his name.

“The only way is to work precisely with special magnifying glasses, removing all the small encrustations one by one,” she said.

On most of these canvases it’s like a thick encrustation of gunk.

“Fall River Boiler,” a black-and-white image that he photographed in 1978 and printed a decade or so later, is a nocturne of texture and tone: feathery asbestos, gloppy encrustations, circular black holes.

They said the investigation revealed that 101 of the items, all covered in dirt and encrustations, were visible and identifiable in photographs found in the possession of known traffickers.