Orchil is a natural dye derived from certain species of lichens, particularly those in the genus Roccella. It has been used for centuries to produce a range of colors, primarily purples and reds, which were highly valued in textiles and art. The dye is extracted by soaking the lichen in a solution, often with the addition of ammonia or other agents to enhance the color. Historically, orchil was significant in the production of royal purple fabrics, which were associated with nobility and wealth. Today, it is less commonly used but remains of interest for those studying natural dyes and sustainable practices in the textile industry.