color
Litmus
A lichen blue-red indicator dye from Rocella and kin, related to orchil chemistry but named for the test paper trade. Not orchil cloth purple alone, and not turnsole.
Also known as Litmus lichen · Litmus dye
color
A lichen blue-red indicator dye from Rocella and kin, related to orchil chemistry but named for the test paper trade. Not orchil cloth purple alone, and not turnsole.
Also known as Litmus lichen · Litmus dye