lacmus

“Cuthbert Gordon credits the development of cudbear in this way; he claimed to find a plentiful source for a certain lichen and, knowing that the purple colors it made are easily destroyed by light, set himself to find a stabilization method. reference Similarly, Jean-Baptiste Pont's descriptions of his inspiration for finding a more efficient dye extraction process was, he claimed, based on knowledge of the high cost of cochineal. reference Other petitions — Johann Carl Barth's for a privilege in Saxony to produce a blue dye from lacmus, for instance — do not mention the discovery process at all but concentrate instead on the economic advantage of the production method and the deliberation that its reworking demanded. 2”

The Creation of Color in Eighteenth-Century Europe

“lis lanceolatis, pinnis oblongis, lacmus ova - tis dentatis, stipite glabro, rachi pubescente.”

Internet Archive: Species plantarum : exhibentes plantas rite cognitas ad genera relatas, cum differentiis specificis, nominibus trivialibus, synonymis selectis, locis natalibus, secundum systema sexuale digestas