COLORING MATTERS. 



37 



96. Red Violet 5 R S. (B.) Sodium salt of 



ethylro5aniline-sulphonic acid. 



Fig. 62, pi. 16; No. 463, S. & J. 



Ilrownish - violet, metallic, glistening 

 lumps. In solution brownish red, 

 brownish red. 



.Saturated. 



Angle 58.5'. Depth o to 0.54 mm. 



General absorption in the green, yel- 

 low, and orange. The ultra-violet 

 absorption is complete from 0.20/i. 

 to 0.36/x. Absorption decreases 

 gradually from o.36,u to a minimum 

 of general absorption near 0.47/i. A 

 weak band has its maximum about 

 0.525;!. The marked slant of the end 

 of the negative shows the presence 

 of appreciable g'eneral absorption in 

 the yellow and orange. Red is trans- 

 mitted. 



97. Alkali Blue 6 B. (A. A. C.) Sodium 



salt of triphenyl-/'-rosaniline - mono- 

 sulphonic acid. 



Fig. 72, pi. 18; No. 476, S. & J. 



Blue powder. In solution blue, deli- 

 cate blue. 



12.5 g. per liter (heated). 



Angle 23.4'. Depth o to 0.21 mm. 



Strong absorption in yellow, orange, 

 and red. Intense, continuous absorp- 

 tion from o.20/t to 0.32/x. Abrupt 

 decrease in absorption from 0.32/i to 

 transparency at 0.345/11. Transparent 

 from 0.345/i to 0.51/1. Strong ab- 

 sorption from 0.51/1 to beyond 0.63/4. 

 No decrease in absorption as far as 

 0.63/1. The apparent increase in ab- 

 sorption near 0.62/1 is due to the 

 relative diminution of sensitiveness 

 of the photographic emulsion. 



98. Methyl Blue. (O.) Sodium salt of tri- 



phenyl - pararosaniline - trisulphonic 

 acid. 



Similar to fig. 71, pi. 18; No. 479, 

 S. &J. 



Dark-blue powder. In solution deep, 

 bright blue, blue. 



6.89 g. per liter. 



Angle 21.3'. Depth o to 0.18 mm. 



Strong absorption in the yellow, orange, 

 and red. The description for solu- 

 tion No. 99 holds here quantitatively. 



99. China Blue. (A.) Sodium salt of the 



trisulphonic acid of triphenylrosani- 

 line and triphenylpararosaniline. 

 Fig. 71, pi. 18; No. 480, S. & J. 



99. China Blue Continued. 



Coppery flakes. In solution blue, blue. 



3-57 S- V^^' 'iter (filtered). 



Angle 23.4'. Depth o to 0.21 mm. 



A hazy-edged band begins in the green 

 and continues into the red. The 

 strong lines around 0.255/1 are trans- 

 mitted by the deepest layer of liquid. 

 Absorption is more or less uniform 

 from 0.20/1 to 0.32/1 and then shades 

 off to transparency at 0.345/1. Trans- 

 parent from 0.345/1 to 0.505/1. Then 

 a band starts and continues with un- 

 diminished intensity to 0.63/1. 



100. Coralline Red. Dioxy-amido-triphenyl- 



carbidrid. 



Fig. 49, pi. 13 ; No. 484, S. & J. 



Reddish-brown lumps. In solution red, 

 salmon pink. 



11.25 per liter (heated). 



Angle 19.5'. Depth o to 0.18 mm. 



Sharp band in blue and green. Very 

 definite at yellow side with maxi- 

 mum in green-yellow. Rather strong 

 absorption from 0.20/1 to 0.27/1, then 

 a decrease to transparency at 0.315/1. 

 Strong absorption from 0.445/1 to 

 0-557y" with maximum at 0.527/1. 

 Probably two unresolved bands with 

 the weaker component at the more 

 refrangible side. Transparent from 

 0.557/1 to 0.63/1. 

 loi. Night Blue. (B.) Hydrochloride of 

 /'-tolyltetraethyl-triamido - diphenyl- 

 a-naphthyl-carbinol. 



Similar to fig. 70, pi. 18; No. 480. 

 S. & J. 



\ iolet, bronzy powder. In solution 

 bright blue, blue. 



2-31 g- per liter. 



Angle 23.4'. Depth o to 0.21 mm. 



Absorption in the yellow, orange, and 

 red. The limit at the green side is 

 steep and the curve is flat in the 

 longer wave-lengths. The visible re- 

 gion of absorption begins about 

 -5~5f^- For the ultra-violet absorp- 

 tion see fig. 70. 

 102. Victoria Blue 4 R. (B.) Hydro- 

 chloride of phenylpenta-methyl-tri- 

 amido-diphenyl - a - naphthyl - car- 

 binol. 



Fig. 70, pi. 18; No. 490, S. & J. 



Bronzy, glistening powder. In solution 

 deep blue, reddish blue. 



2.78 g. per liter (heated). 



Angle 27.3'. Depth o to 0.25 mm. 



