42 



ATLAS OF ABSORPTION SPECTRA. 



122. Phenosafranine Continued. 



Band in blue and blue-green, not sharp 

 at edges. The ultra-violet band ends 

 about 0.3 i/i,. The visible band ab- 

 sorbs from o.45ft to 0.545/x with 

 maximum at 0.50/^. Transparent 

 from 0.545^11 to 0.63/x. 



123. Safranine. (B.) Mixture of diamido- 



phenyl- and tolyl-tolazonium chlo- 

 rides. 



Similar to fig. 54, pi. 14; No. 584, 

 S. & J. 



Reddish-brown powder. In solution 

 red, red. 



5 g. per liter. 



Angle 27.3'. Depth o to 0.25 mm. 



Definite absorption in blue-green and 

 green. Similar absorption to that 

 of solution No. 122. Strong ab- 

 sorption from o.20fi to 0.28/x. Rapid 

 decrease in absorption from o.28|t 

 to 0.32^. Absorption begins again 

 at 0.44/i, increases to a maximum 

 near o.495;u,, and then decreases to 

 transparency at 0.555/1. Transparent 

 from o.555;tt to 0.63/*. 



124. Heliotrope 2 B. (A.) Dimethyldiam- 



ido-xylyl - xylophen-azonium chlo- 

 ride. 



Fig. 68, pi. 17; No. 590, S. & J. 



Grayish-green powder. In solution 

 reddish violet, reddish violet. 



7 g. per liter. 



Angle 27.3'. Depth o to 0.25 mm. 



Strong band in yellow and orange. 

 Transparent to deep red. Strong 

 absorption from 0.48/1 to 0.605/1 with 

 maximum near 0.535/1. Increasing 

 transparency from 0.605/1 into the 

 red. 



125. Rosolane O. (M.) Phenyldiamido- 



phenyl-toluphen-azonium chloride. 



Similar to fig. 19, pi. 5; No. 591, 

 S. & J. 



Olive-green powder. In solution deep 

 violet, faint, reddish violet. 



9 g. per liter f warmed and filtered). 



Angle 35.1'. Depth o to 0.32 mm. 



Weak band in the green broadening 

 out into general absorption on the 

 red side. Somewhat similar absorp- 

 tion to that of solution No. 106. 

 The visible band is definitely V- 

 -shaped and slopes more at its less 

 refrangible side than at its blue 

 boundary. Slight transparency at 

 0.23/t is followed by a maximum of 



125. Rosolane O Continued. 



absorption near 0.27/1. Absorption 

 ceases about 0.33/1 and begins again 

 at 0.495/1. The latter band has its 

 maximum at 0.525/1 and fades into 

 general absorption around 0.563/1. 

 The end of the positive slants ap- 

 preciably, thus emphasizing the gen- 

 eral absorption in the orange. Trans- 

 parent to the red. 



126. Nigrosine, soluble. (A.) Sodium salts 



of sulphonic acids of spirit nigro- 

 sines. 



Somewhat like figs. 20 and 21 of pis. 

 5 and 6, respectively ; No. 602, S. & J. 



Coal-black, glistening lumps. In solu- 

 tion blackish blue, dull blue. 



Saturated. 



Angle 31.2'. Depth o to 0.29 mm. 



Very indefinite absorption in the yel- 

 low and orange. The ultra-violet 

 absorption is like that of solution 

 No. 127, while the visible absorp- 

 tion is similar to that of solution 

 No. 46. However, the band at 

 0.528/1 is incomparably weaker than 

 the corresponding band of solution 

 No. 46. Absorption rather strong 

 between 0.20/* and 0.3O/1. From 0.30ft 

 the absorption decreases to transpar- 

 ency at o.35/t. Diflferent photo- 

 graphic emulsions show a weak 

 band about 0.528/1. Absorption 

 continues genera! into the red, as is 

 shown by the appreciable slant of the 

 end of the negative. 



127. Naphthalene Red. Mixture of amido- 



naphthyl-naphthazonium chloride and 

 diamido - naphthyl - naphthazonium 

 chloride. 



Fig. 20, pi. 5 ; No. 614, S. & J. 



Dark-brown powder. In solution red, 

 faint pink. 



Saturated (heated). 



Angle 31.2'. Depth o to 0.29 mm. 



Hazy-edged absorption band in the 

 green. The visible band extends 

 from 0.488/1 to o.54S/t with its max- 

 imum at 0.517/1. The slight inclina- 

 tion at the red end of the negative 

 shows appreciable decrease of trans- 

 parency, between 0.545/1 and 0.63/x, 

 with increase of thickness of absorb- 

 ing layer. 



128. Alizarine Green B. (D.) Dioxy- 



naphthazoxonium sulphonate. 

 No. 647, S. & J. * 



Spectrogram too indefinite for reproduction. 



