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A ground or primer is the background surface on which you paint. It is usually a coating such as a gesso primer, which physically separates your painting from the support. It is the foundation of a painting, applied onto the raw canvas, paper, or other support.
Keeping this in view, what is support in painting?
The term "support" refers to any material onto which paint is applied. Canvas, wood, and paper are common painting supports, but the types of supports used for artwork are very extensive. Wooden panels, linen and animal skins were among the first supports used for tempera painting.
Consequently, what is a ground color?
noun. Also called ground coat. a primary coat of paint; priming; base coat. the background color, as of a painting or decoration.
Acrylic Ground for Pastels is a ground developed to prepare canvas and other supports for pastels and materials including, graphite, pencil, charcoal and chalk. The medium provides a tooth similar to pastel and charcoal papers.