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Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A fluorimetric reagent, 5-chloro-2-hydroxy-3-[(2Z)-2-(2-hydroxy-4-oxocyclohexa-2,5-dien-1-ylidene)hydrazinyl]benzenesulfonic acid, for the detection of aluminum, gallium and other metals Full definition →
Etymology from Wiktionary, CC BY-SA 4.0.