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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.
A knowledge of this fact is important, or it may be mistaken for magenta. The behavior of the amylic alcohol, thus colored red, with hydrochloric acid and ammonia is characteristic. If the red color is due to magenta, it is destroyed by both these reagents, while hydrocholoric acid does not decolorize the solutions of archil and cudbear, and ammonia turns their red color to a purple violet.
If the red color of the wool is due to archil or cudbear, it is extracted by hydrochloric acid, which is colored red. Ammonia turns the color to a purple violet. Koenig mixed 50 c.c. wine with ammonia in slight excess, and places in the mixture about one-half grm. clean white woolen yarn. The whole is then boiled in a flask until all the alcohol and the excess of ammonia are driven off.
Several announcements of "Feed," whatever that may be, not restaurant dinners, anyhow, also of "Shorts," terms mysterious to city ears as jute and cudbear and gunnybags to such as drive oxen in the remote interior districts. Then the marriage column above alluded to, by the fortunate recipients of the cake.
The raw material is a coal-tar naphtha called toluene or toluol, which is also the raw material for saccharin, a sweetening agent made from coal-tar. This artificial indigo is proving a formidable rival to the natural product. The lichens thus treated acquire gradually a deep purple colour, and form the products called "cudbear."
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.
Several announcements of "Feed," whatever that may be, not restaurant dinners, anyhow, also of "Shorts," terms mysterious to city ears as jute and cudbear and gunnybags to such as drive oxen in the remote interior districts. Then the marriage column above alluded to, by the fortunate recipients of the cake.
The inferior qualities of the weed, and also a variety of mosses that have the same properties as the orchilla, only in a minor degree, are dried and ground to a fine powder, which is denominated cudbear, and is applicable to the same purposes as the weed itself.
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