154 THE AMERICAN MONTHLY [May, 



CYANIN. Chinolin Blue. 



Green shining crystals. 



In water, insoluble in cold ; by heating with difficulty soluble with a vio- 

 let blue color. HCl to a watery solution, decolorization. NaOH to a watery 

 solution ; cold, a bluish bronze like precipitate; warm, a brownish precipitate. 

 H2 SO4 concentrated, colorless. Dilution with water colorless. 



EOSIN. Eosin A. Eosin GGF. Water Soluble Eosin. Eosiu B. 



Reddish, blue shining crystals or brownish powder. 



In water, easily soluble with bluish red color ; the diluted solution shows a 

 greenish fluorescence. In alcohol readily soluble with bluish red color and 

 yellowish green fluorescence. HCl to watery solution, yellowish red floculi. 

 NaOH to watery solution, no change. H2 SOi Cone, yellowish solution. 

 Dilution with water, yellowish red precipitate. 



FUCHSIN. Rubin. Magenta. Aniline Red. Rosein. 



Found as Chlorhydrate, Acetate, Nitrate and Sulphate. 



As Chlorhydrate, Cautharides like shining crystals. As Acetate, irregular 

 green shining pieces. As Sulphate, fine green shining crystalline powder. 



In water, soluble with red color. In alcohol soluble with red color. HCl 

 to watery solution, yellowish. NaOH to watery solution, decolorization. 

 K2 SO4 Cone, yellowish brown solution. Dilution with water, nearly col- 

 orless. 



FUCHSIN, S. Acid Fuchsin. Rubin S. Acid Rubin. Acid Magenta. 



Metallic green shining grains or powder. 



In water, soluble with bluish red color. In alcohol insoluble. HCl to 

 watery solution, no change. NaOH to watery solution, complete decolor- 

 ization. H2 SO4 Cone, yellowish solution. Dilution with water, gradually 

 red. 



INDULIN. Indulin N N. Nigrosin sol. in water. True Blue R. True 

 Blue 3 R. 



Indulin, bronze shining powder. Nigrosin, black shining fragments. 



In water, soluble with a blue violet color. In alcohol, blue solution. HCl 

 to watery solution, becomes more blue. NaOH to watery solution, brownish 

 violet precipitate. H2 SO4 Cone, blue solution. Dilution with water, vio- 

 let solution. 



IODINE GREEN. Night Green. Metternichs Green, Vert lumiere. 



Hard dark green pieces. 



In water, easily soluble with a bluish green color. HCl to watery solu- 

 tion, reddish yellow color. NaOH to watery solution, colorless. H2 SO4 Cone, 

 soluble with reddish yellow color. Dilution with water, weak yellowish 

 green. 



METHYL BLUE. Brilliant Cotton Blue. Methyl water Blue. 



A dark blue powder. 



In water, soluble with a blue color. H CI to a watery solution, no change. 

 Na OH to a watery solution, a reddish brown solution. H2 SO4 Cone, so- 

 luble with red brown color. Dilution with water, a blue solution. 



METHYL GREEN. Paris Green. Vert Etincelle. Light Green. Green of 

 Methyl Aniline. Double Green. Green Powder. 



Green Crystals. 



In water, easily soluble with bluish green color. Insoluble in Amyl 

 alcohol. H CI to watery solution, yellowish red color, which becomes 

 yellowish green on addition of water. Na OH to watery solution, becomes 

 colorless. H2 SO4 Concentrated soluble with ypllov^ish red color. Dilutipq 

 Tvith water, yellowish green solution. 



