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If the wine is examined according to the Falieres-Ritter method in presence of magenta, ether, when shaken up with the wine, previously rendered ammoniacal, remains colorless, while if archil or cudbear is present the ether is colored red. Wartha has made a convenient modification in the Falieres-Ritter method by adding ammonia and ether to the concentrated wine while still warm.
The most suitable methods for the detection of magenta are those given by Romei and Falieres-Ritter. If a wine colored with archil and one colored with cudbear are treated treated according to Romei's method, the former gives, with basic lead acetate, a blue, and the latter a fine violet precipitate. The filtrate, if shaken up with amylic alcohol, gives it in either case a red color.
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