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Final answer:The common binder in watercolor paints is gum arabic, a water-soluble compound from acacia tree sap. It is used for its properties of easy dissolution and maintaining pigment suspension.Explanation:The common binder used for watercolor paints is gum arabic, which is a water-soluble compound made from the sap of the acacia tree. Gum arabic is favored for its ability to dissolve easily in water and hold the pigment in suspension. Unlike watercolor, which typically lacks white pigment and relies on the white of the paper for highlights, other painting mediums like oil paint use different binders;linseed oilis commonly used in oil painting for its flexibility and slower drying properties. The history of paint binders is varied, with materials such asegg yolkused in egg tempera andturpentineor mineral spirits used in oil painting as part of the vehicle....