I bought a 1906 house recently… I was stripping wallpaper and a LOT of the 2 layers of modern plaster came off. Underneath is this grey layer with horsehair(?) in it. This
mixing gesso and calcimum carbonate chalk - WetCanvas: Online Living for Artists
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Jove' Plaster/stone effect with yellows, burnt and raw umber and
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MOLD coating wall fake STONE wall panel 3d in chalk VENEER STONE MOLD | eBay
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Chalk plasters from the landscape - Local Works Studio