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Gesso is traditionally a mix of an animal glue binder (usually rabbit-skin glue), chalk, and white pigment. For priming flexible canvas, an emulsion of gesso and linseed oil, also called "half-chalk ground", is used. [4] Acrylic gesso is a mixture of white pigment and some kind of filler (chalk, silica, etc.) and acrylic resin dispersed in water.
There are many different techniques one can use when creating an acrylic pour painting, however, the flip cup pouring technique discussed below is a good one for beginners and experienced painters. To start, elevate the canvas to where it's flat and easy to pick up and move around. Place four cups underneath each corner of the canvas. [4]
Although canvas needs to be properly primed before painting with oils to prevent the paint medium from eventually rotting the canvas, acrylic can be safely applied straight to the canvas. The rapid drying of acrylic paint tends to discourage blending of color and use of wet-in-wet technique as in oil painting. Even though acrylic retarders can ...
Acrylic gesso is very difficult to sand. One manufacturer makes a "sandable" acrylic gesso, but it is intended for panels only and not canvas. It is possible to make the gesso a particular color, but most store-bought gesso is white. The gesso layer, depending on its thickness, will tend to draw the oil paint into the porous surface.
A canvas sized with rabbit-skin glue can be made tighter than with other alternatives—such as an acrylic-based gesso—because of the shrinkage. This type of canvas is also valuable because it can be sanded to a flatter texture, which allows the painter to achieve a finer level of detail than can be achieved with a typical acrylic gesso ground.
A detail of a self-portrait by Rembrandt.Three scratches in the center reveal the reddish ground. In visual arts, the ground (sometimes called a primer) is a prepared surface that covers the support of the picture (e.g., a canvas or a panel) and underlies the actual painting (the colors are overlaid onto the ground).