Azolitmine
The azolitmine is one of the two components of the reagent called Tournesol or litmus . This water soluble red dye was extracted by Robert Kane about 1840. This reagent transfers with blue in alkaline environment (or basic).
Source
Robert Kane - Memory to be used for the chemical history of the orchil and the sunflower , in Yearly of chemistry and physics (year 1841, 3rd series, Volume 2).