Erythroléine
The érythroléine is an oily liquid extracted by Robert Kane from the Orseille and the Tournesol, of rough Formule . This soluble reagent in the ether, which enters the composition of the Paper litmus, transfers with the red in acid environment.
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).
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