Dye-producing lichens are unique organisms that can create natural dyes used in textiles and crafts. These lichens contain pigments that can produce a range of colors, including yellows, reds, and blues. Common examples include Roccella tinctoria and Usnea species, which have been used for centuries in traditional dyeing processes. These lichens thrive in various environments, often found on rocks and trees. They are sensitive to pollution, making them important indicators of environmental health. The use of dye-producing lichens is gaining interest in sustainable practices, as they offer an eco-friendly alternative to synthetic dyes.