The most common ground or primer used to prepare a support for painting is called , which consists of glue and plaster of Paris or chalk.

The most common ground or primer used to prepare a support for painting is called Gesso which consists of glue and plaster of Paris or chalk.

Explanation:

Four types of preparations are distinguished according to the binder: Glue-chalk (traditional gesso), half-fat or half-oil or emulsion (binder is an emulsion - a mixture of hydrophilic and hydrophobic binder), oil (binder is oil) and dispersive (binder is a dispersion of acrylic resin in water) The preparation consists of binders, fillers and bleach, which give it the required density, whiteness, ability to absorb and bind color. The fillers could be: chalk (champagne chalk, mountain chalk), gypsum (Bologna chalk), kaolin. The bleaches could be: titanium white, zinc white, lithopone, lead white. The binder gives specific properties to the preparation, adapts it to the technique and the image carrier (For Gesso it is a natural glue).

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