Stain Painting refers to a technique where thinned paint, typically acrylics, is applied to raw, unprimed canvas, allowing the paint to soak into the fabric and become a part of it. This method can create unique, often unpredictable effects and textures. The paint is usually thinned with water, and sometimes a Wetting Aid is added to control the absorption and flow of the paint. Stain Painting can be a dynamic and expressive technique, but it also requires some caution, as the paint's interaction with the raw canvas can be unpredictable, and the canvas may be more prone to degradation over time. Golden Artist Colors provides guidance and recommendations for using their acrylics in Stain Painting techniques, including the use of Wetting Aid and other mediums to achieve desired effects. (Source IDs: 1, 4, 5, 7)