How to prepare gypsum for in-filling and for the preparation of gypsum and glue: weigh 10 grams of rabbit glue in grains or ground, and put it to soak for a few hours …
In modern and specialized literature, the term “primer” indicates the finishing layer of a preparation, characterized by limited thickness and a smooth and uniform surface, in order to facilitate the gliding of brush strokes.
The “mestica” is a colored primer characterized by the use of fatty substances, clay, fixed oils or greasy paints, however quite distinct from the most ancient gypsum and glue preparation.
The operational precepts are extensively described by Cennino Cennini (The Book of Art, late Fourteenth Century) who, specifying the various fundamental phases for a preparation with gypsum and glue, handed down the customs typical of Mediterranean countries.
Layer or set of the first layers of material applied to the support to obtain a suitable surface for pigments according to the painting technique adopted.
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