Fatten up
Short Guide, Lime Mortars in Traditional Buildings, published on 1 March 2013 by Historic Scotland, defines fatten up as: ‘The cyclical process of dissolution (or water absorption) and reprecipitation of uncarbonated lime particles that leads to an increase in the plasticity of the mortar due to the precipitation of increasingly finer crystals. Well matured lime is said to be ‘fat’.’
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