Binder

A binder is the substance that holds pigment particles together and makes paint stick to a surface. It is the “glue” of paint.

1. A binder is the material that surrounds and binds pigment particles in a paint mixture, creating a stable film that adheres to a surface after drying.

   The binder determines many important characteristics of a paint, including its texture, transparency, gloss, durability, drying time, and how the pigment behaves when applied.

   Different types of paint use different binders:

   • Oil paint: uses drying oils, mainly linseed oil, as a binder.
   • Acrylic paint: uses an acrylic polymer emulsion as a binder.
   • Watercolor and gouache: traditionally use gum arabic as a binder.
   • Tempera: uses binders such as egg yolk (egg tempera) or other emulsions.
   • Fresco: uses lime (calcium hydroxide) as part of the binding process.

In painting materials, a paint is generally made of two main components: pigment and binder. Pigments provide color, while the binder transforms those dry particles into a usable paint.

The relationship between pigment and binder affects the final appearance of a color. For example, the same pigment can look different depending on the binder used: oil may increase depth and saturation, while watercolor allows more transparency because of the way light passes through the paint layer.

Understanding binders is essential for artists because they influence not only the visual qualities of a painting but also its conservation, aging, and compatibility with different surfaces.

• Pigment gives color; binder creates the paint.
• The binder holds pigment particles together and allows them to adhere to a surface.
• The type of binder determines the properties of the paint, including drying behavior, texture, transparency, and durability.
• The balance between pigment and binder affects color strength and handling qualities.