Which binder is traditionally used in watercolor painting?

• A. Linseed oil
• B. Acrylic polymer
• C. Gum Arabic
• D. Beeswax

Answer: (C)

The thing being tested is what binds watercolor pigments to paper. Watercolor relies on a binder that is water-soluble and can form a thin, transparent film as it dries, allowing washes to remain bright and easily re-wetted. Gum Arabic fits this role perfectly: it comes from the sap of acacia trees, dissolves in water, and helps pigment stay suspended while you paint, then dries to a clear, flexible film that preserves transparency and allows adjustment with additional washes. This traditional use of Gum Arabic has defined watercolor technique for centuries, giving you the characteristic light, luminous layers.

Linseed oil binds oil paints, creating a thick, durable film that isn’t water-soluble. Acrylic polymer is the binder for acrylic paints, forming a plastic-like film that dries quickly and resists water after drying. Beeswax is used in encaustic or wax-based media, not traditional watercolor.