What is the term for designs where tone-on-tone or positive/negative patterns are achieved using various fabrics?

The term for designs where tone-on-tone or positive/negative patterns are achieved using various fabrics is damask. Damask is a weaving technique that creates intricate, reversible patterns typically in a single color or in shades of the same color, which allows for the subtle contrast of texture and sheen. This results in a sophisticated, elegant look that incorporates both light and shadow effectively through its design.

In contrast, jacquard refers to a specific type of fabric that uses a special weaving technique to produce complex patterns, but it does not specifically focus on the tone-on-tone or positive/negative aspect. Brocade is a heavier fabric that often incorporates metallic threads into its designs, leading to a more ornate and raised pattern, which also does not typically highlight the tone-on-tone effect. Satin is a type of weave known for its smooth and shiny surface; it can be used in various designs but does not inherently relate to the technique of creating those specific patterns. Thus, damask stands out as the correct term for the described design characteristics.