Which binder is traditionally used in gouache paint?

Gouache paint typically uses gum arabic as its binder, which is a natural gum obtained from the acacia tree. This choice is significant because gum arabic dissolves in water, allowing for the re-wettable characteristics of gouache, which is essential for artists who want to create opaque layers and blend colors easily. The use of gum arabic contributes to the paint's smooth consistency and vibrant appearance, making it ideal for a range of artistic applications from illustrations to fine art.

In contrast, other binders such as poppy oil, egg yolk, and linseed oil are used in different types of paint mediums. For example, egg yolk serves as a binder in traditional egg tempera, while linseed oil is a common binder in oil paints. Poppy oil is sometimes used in oil painting for its light color and slow drying properties but is not relevant to gouache. Understanding the specific characteristics and applications of various binders is crucial for artists when selecting materials for their work.