What is another word for orchil?
Pronunciation: [ˈɔːkɪl] (IPA) 
Orchil refers to a lichen that is used in dyeing and as a source of litmus dye. Some synonyms for orchil are "litmus," "cudbear," and "turnsole." Litmus is a blue dye that is made by treating orchil with alkaline substances. Cudbear is another type of dye made from orchil, which was commonly used in Scotland during the Middle Ages. Turnsole is a dye extracted from certain plant species, but it can also be made from orchil by treating it with an acid. These synonyms highlight the important role that orchil has played in the history of dyeing and color chemistry.
