34 



ATLAS OF ABSORPTION SPECTRA. 



78. Congo Brown R Continued. 



Same visible and photographic absorp- 

 tion as No. 77. The change in tlie 

 constitution is from benzene to naph- 

 thalene. 



79. Fast Green O. (M.) Dinitroso-resor- 



cinol. (Dioximidoquinone.) 



Similar to fig. 11, pi. 3 ; No. 394, S. & J. 



Grayish-brown powder. In solution 

 deep cofifee brown, coffee brown. 



Saturated (heated). 



Angle 1 6'. Depth 0.05 to 0.66 mm. 



General absorption in violet and blue. 

 Similar absorption to that of solu- 

 tion No. 47. The boundaries of the 

 hands, however, are more definite for 

 solution No. 79 than for solution No. 

 47. From o.20;u, to 0.325^4 the ab- 

 sorption is complete. Absorption de- 

 creases with a long, gradual slope, 

 from 0.325/^ to a minimum of semi- 

 transparency at 0.47S/J.. Then a 

 weak band with maximum at 0.52/i 

 presents itself and continues to o.S4lf- 

 Only very weak absorption is 

 present from 0.54/i to 0.63/^. With 

 the same solution and the cell 

 set for 35.1' and 0.32 mm. the ab- 

 sorption was almost complete from 

 o.20fi to o.30;u. and then sloped gradu- 

 ally to transparency at 0.405/4. The 

 band at 0.52/A could not be dis- 

 cerned. 



80. Naphthol Green B. (C.) Ferrous so- 



dium salt of nitroso-/?-naphthol-^- 

 monosulphonic acid. 



Fig 10, pi. 3 ; No. 398, S. & J. 



Dark-green powder. In solution green, 

 light green. 



8.75 g. per liter (boiled). 



Angle 31.2'. Depth o to 0.29 mm. 



Absorption in violet and in dark red. 

 Absorption very strong from o.zOfj. 

 to 0.3 i/n. Then the absorption de- 

 creases very gradually, with a long 

 slant, to o.455ft. From 0.455/4 to the 

 orange the transparency is complete. 

 Absorption begins again in the red. 



81. Curcumine S. (A.) Sodium salt of 



the so-called azoxy - stilbene - disul- 



phonic acid. 

 Fig. 37, pi. 10; No. 399, S. & J. 

 Brown powder. In solution yellow, 



faint yellow. 

 Saturated. 

 Angle 1 10'. Depth o.ii to 0.75 mm. 



81. Curcumine S Continued. 



Faint absorption in violet. Absorption 

 decreases from 0.20/i to 0.29/4. Trans- 

 parent from 0.29/A to 0.34/1. Weak 

 band from 0.34/1 to 0.43/4 with max- 

 imum at 0.39/1. Transparent from 

 0.43/1 to 0.63/4. 



82. Auramine O. (B.) Hydrochloride of 



amido-tetramethyl-diamido-diphenyl- 

 methane. 



Fig. 43, pi. 11; No. 425. S. & J. 



Sulphur-yellow powder. In solution 

 yellow, faint yellow. 



Equal volumes of a saturated solution 

 and of water (filtered). 



Angle 42.5'. Depth o to 0.36 mm. 



Strong absorption in violet and indigo. 

 Relatively transparent at 0.22/1. The 

 continuous background of the spark 

 indicates one band or, at most, two 

 bands from 0.23/1 to 0.275/1. Un- 

 usually transparent from 0.275/4 to 

 0.345/4. A pair of partially-resolved 

 intense bands absorb from 0.345/1 to 

 o.47/t. Their maxima lie at 0.365/1 

 and 0.425/1. The intervening, par- 

 tially-transparent spot is near 0.385/1. 

 The less refrangible band is the more 

 intense and is very round. Trans- 

 parent from 0.470/4 to 0.63/1. 



83. Malachite Green. (M.) Oxalate of 



tetramethyl - di-/-amido - triphenyl- 

 carbinol. 



Similar to fig. 46, pi. 12; No. 427, 

 S. & J. 



Green, metallic, glistening plates. In so- 

 lution greenish blue, greenish blue. 



3.75 g. per liter. 



Angle 25.5'. Depth o to 0.21 mm. 



Strong, double band in the orange and 

 clear red. Deep red is transmitted. 

 Similar absorption to that of solution 

 No. 86 from 0.20/4 to the yellow. All 

 strong lines in the extreme ultra- 

 violet are transmitted freely. Ab- 

 sorption band lies between 0.29/4 and 

 0.33/1. A faint band has its maximum 

 near 0.425/4. Strong absorption com- 

 mences at 0.55/4. 



84. Emerald Green. (B.) Sulphate or 



zinc - double - chloride of tetraethyl- 

 diamido-triphenyl-carbinol. 



Similar to fig. 46, pi. 12; No. 428, 

 S. & J. 



Golden, glistening crystals. In solu- 

 tion green, green. 



4.62 g. per liter. 



