Lead-coloured

Look at those big, isolated clumps of building rising up above the slates, like brick islands in a lead-coloured sea.

"Look at those big, isolated clumps of building rising up above the slates, like brick islands in a lead-coloured sea." "The board-schools." "Light-houses, my boy! Beacons of the future! Capsules with hundreds of bright little seeds in each, out of which will spring the wise, better England of the future."