Kerakoll

An Emilian house at Sassuolo whose Biocalce line is lime as an industrial maker sees it: an EN 459-1 certified NHL 3.5 plaster, a lime-putty stucco, an earth-pigment wash, each with its data sheet and its GreenBuilding rating.

It is the far end of the trade from a limewash workshop — standardised products, available anywhere, whose yield and vapour permeability are known before the sack is opened.