La composizione degli stucchi a Genova tra Cinquecento e Novecento.

The \u201cGenoa Old City Cultural Map\u201d, made inside European Program "Life", referred at 2.344 building, and the analysis of many mortars coming from front of some of the most important building of the town, made for restoring, are the foundation of this article. The 13 % of about 5000 fronts exhibits, on one side at least, decorations like frames and plasters. They are buildings of the period between XVI and XIX century when were used mortars made of lime and sand, with the progressive substitution of magnesian lime with pure lime and the complete elimination of the chalk. It's evident that there is a discordance between practic information from pre-industrial age, based of empiric methods, and technical information from post-industrial age, based of analytical observations