Dyeing.

The use of dye and pattern began in the Paleolithic era (2000 BCE) with cave paintings in Europe and the Americas. Later, humans painted their bodies with minerals or plant-based dyes before using dyes on fabric. Tribes in the Amazon used annatto, derived from the seeds of the achiote tree, as body paint, while Britain's Celts used blue dyes from the woad plant to create blue body paint. Some North American Indian tribes mixed bloodroot with bear grease to make war paint. Gradually people also began to dye the fabrics they wore and used in their homes. Other substances in nature such as clay, mud, or the purple dye made from seashells have also been used to dye fabrics or yarn.